81727233288 has 32 divisors (see below), whose sum is σ = 208665279360. Its totient is φ = 26662784960.

The previous prime is 81727233277. The next prime is 81727233299. The reversal of 81727233288 is 88233272718.

It is an interprime number because it is at equal distance from previous prime (81727233277) and next prime (81727233299).

It is a super-2 number, since 2×81727233288² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81727233288.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36225483 + ... + 36227738.

It is an arithmetic number, because the mean of its divisors is an integer number (6520789980).

Almost surely, 2^81727233288 is an apocalyptic number.

It is an amenable number.

81727233288 is an abundant number, since it is smaller than the sum of its proper divisors (126938046072).

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

81727233288 is a wasteful number, since it uses less digits than its factorization.

81727233288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72453277 (or 72453273 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 51.

The spelling of 81727233288 in words is "eighty-one billion, seven hundred twenty-seven million, two hundred thirty-three thousand, two hundred eighty-eight".