81364632 has 32 divisors (see below), whose sum is σ = 206202480. Its totient is φ = 26749440.

The previous prime is 81364627. The next prime is 81364681. The reversal of 81364632 is 23646318.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 81364593 and 81364602.

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, 21469 + ... + 24972.

Almost surely, 2^81364632 is an apocalyptic number.

It is an amenable number.

81364632 is an abundant number, since it is smaller than the sum of its proper divisors (124837848).

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

81364632 is a wasteful number, since it uses less digits than its factorization.

81364632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46523 (or 46519 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 81364632 is about 9020.2345867499. The cubic root of 81364632 is about 433.3231466376.

The spelling of 81364632 in words is "eighty-one million, three hundred sixty-four thousand, six hundred thirty-two".