81888752 has 20 divisors (see below), whose sum is σ = 173083416. Its totient is φ = 37222080.

The previous prime is 81888749. The next prime is 81888769. The reversal of 81888752 is 25788818.

It is a junction number, because it is equal to n+sod(n) for n = 81888697 and 81888706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232463 + ... + 232814.

Almost surely, 2^81888752 is an apocalyptic number.

It is an amenable number.

81888752 is an abundant number, since it is smaller than the sum of its proper divisors (91194664).

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

81888752 is a wasteful number, since it uses less digits than its factorization.

81888752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465296 (or 465290 counting only the distinct ones).

The product of its digits is 286720, while the sum is 47.

The square root of 81888752 is about 9049.2404101118. The cubic root of 81888752 is about 434.2515901990.

The spelling of 81888752 in words is "eighty-one million, eight hundred eighty-eight thousand, seven hundred fifty-two".