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231880 = 235111731
BaseRepresentation
bin111000100111001000
3102210002011
4320213020
524410010
64545304
71654015
oct704710
9383064
10231880
11149240
12b2234
138170c
146070c
1548a8a
hex389c8

231880 has 64 divisors (see below), whose sum is σ = 622080. Its totient is φ = 76800.

The previous prime is 231877. The next prime is 231893. The reversal of 231880 is 88132.

It can be divided in two parts, 231 and 880, that added together give a palindrome (1111).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7465 + ... + 7495.

It is an arithmetic number, because the mean of its divisors is an integer number (9720).

2231880 is an apocalyptic number.

231880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311040).

231880 is an abundant number, since it is smaller than the sum of its proper divisors (390200).

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

231880 is a wasteful number, since it uses less digits than its factorization.

231880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 231880 is about 481.5391988198. The cubic root of 231880 is about 61.4357404907.

The spelling of 231880 in words is "two hundred thirty-one thousand, eight hundred eighty".

Divisors: 1 2 4 5 8 10 11 17 20 22 31 34 40 44 55 62 68 85 88 110 124 136 155 170 187 220 248 310 340 341 374 440 527 620 680 682 748 935 1054 1240 1364 1496 1705 1870 2108 2635 2728 3410 3740 4216 5270 5797 6820 7480 10540 11594 13640 21080 23188 28985 46376 57970 115940 231880