81265688 has 32 divisors (see below), whose sum is σ = 174928800. Its totient is φ = 34670592.

The previous prime is 81265673. The next prime is 81265699. The reversal of 81265688 is 88656218.

It is a super-2 number, since 2×81265688² = 13208224092226688, which contains 22 as substring.

It is a congruent number.

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, 9656 + ... + 15992.

It is an arithmetic number, because the mean of its divisors is an integer number (5466525).

Almost surely, 2^81265688 is an apocalyptic number.

It is an amenable number.

81265688 is an abundant number, since it is smaller than the sum of its proper divisors (93663112).

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

81265688 is a wasteful number, since it uses less digits than its factorization.

81265688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6579 (or 6575 counting only the distinct ones).

The product of its digits is 184320, while the sum is 44.

The square root of 81265688 is about 9014.7483603260. The cubic root of 81265688 is about 433.1474268951.

The spelling of 81265688 in words is "eighty-one million, two hundred sixty-five thousand, six hundred eighty-eight".