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81344510 = 25131932933
BaseRepresentation
bin1001101100100…
…11011111111110
312200001201200122
410312103133332
5131311011020
612023254542
72005263002
oct466233776
9180051618
1081344510
1141a0a375
12232aa452
1313b11360
14ab36702
15721c125
hex4d937fe

81344510 has 32 divisors (see below), whose sum is σ = 165987360. Its totient is φ = 28453248.

The previous prime is 81344479. The next prime is 81344521. The reversal of 81344510 is 1544318.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 81344510.

It is a congruent number.

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, 13997 + ... + 18936.

It is an arithmetic number, because the mean of its divisors is an integer number (5187105).

Almost surely, 281344510 is an apocalyptic number.

81344510 is an abundant number, since it is smaller than the sum of its proper divisors (84642850).

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

81344510 is a wasteful number, since it uses less digits than its factorization.

81344510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32972.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81344510 is about 9019.1191365898. The cubic root of 81344510 is about 433.2874224864.

Adding to 81344510 its reverse (1544318), we get a palindrome (82888828).

The spelling of 81344510 in words is "eighty-one million, three hundred forty-four thousand, five hundred ten".

Divisors: 1 2 5 10 13 19 26 38 65 95 130 190 247 494 1235 2470 32933 65866 164665 329330 428129 625727 856258 1251454 2140645 3128635 4281290 6257270 8134451 16268902 40672255 81344510