81856752 has 40 divisors (see below), whose sum is σ = 214450560. Its totient is φ = 26900160.

The previous prime is 81856729. The next prime is 81856757. The reversal of 81856752 is 25765818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81856757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8602 + ... + 15417.

It is an arithmetic number, because the mean of its divisors is an integer number (5361264).

Almost surely, 2^81856752 is an apocalyptic number.

It is an amenable number.

81856752 is an abundant number, since it is smaller than the sum of its proper divisors (132593808).

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

81856752 is a wasteful number, since it uses less digits than its factorization.

81856752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24101 (or 24095 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 81856752 is about 9047.4721331430. The cubic root of 81856752 is about 434.1950180772.

The spelling of 81856752 in words is "eighty-one million, eight hundred fifty-six thousand, seven hundred fifty-two".