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31312200330 = 23251312655827
BaseRepresentation
bin11101001010010110…
…100100001010001010
32222211012102120211100
4131022112210022022
51003111410402310
622215025042230
72155642211535
oct351226441212
988735376740
1031312200330
1112308a14614
12609a486376
132c501b22b8
141730823a1c
15c33e28ec0
hex74a5a428a

31312200330 has 48 divisors (see below), whose sum is σ = 82033215264. Its totient is φ = 8286177120.

The previous prime is 31312200319. The next prime is 31312200341. The reversal of 31312200330 is 3300221313.

31312200330 is a `hidden beast` number, since 3 + 1 + 312 + 20 + 0 + 330 = 666.

It is an interprime number because it is at equal distance from previous prime (31312200319) and next prime (31312200341).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1316124 + ... + 1339703.

It is an arithmetic number, because the mean of its divisors is an integer number (1709025318).

Almost surely, 231312200330 is an apocalyptic number.

31312200330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31312200330 is an abundant number, since it is smaller than the sum of its proper divisors (50721014934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31312200330 is a wasteful number, since it uses less digits than its factorization.

31312200330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655971 (or 2655968 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 31312200330 its reverse (3300221313), we get a palindrome (34612421643).

The spelling of 31312200330 in words is "thirty-one billion, three hundred twelve million, two hundred thousand, three hundred thirty".

Divisors: 1 2 3 5 6 9 10 15 18 30 45 90 131 262 393 655 786 1179 1310 1965 2358 3930 5895 11790 2655827 5311654 7967481 13279135 15934962 23902443 26558270 39837405 47804886 79674810 119512215 239024430 347913337 695826674 1043740011 1739566685 2087480022 3131220033 3479133370 5218700055 6262440066 10437400110 15656100165 31312200330