81386432 has 28 divisors (see below), whose sum is σ = 163555680. Its totient is φ = 40175616.

The previous prime is 81386407. The next prime is 81386471. The reversal of 81386432 is 23468318.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81386392 and 81386401.

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, 2993 + ... + 13104.

Almost surely, 2^81386432 is an apocalyptic number.

It is an amenable number.

81386432 is an abundant number, since it is smaller than the sum of its proper divisors (82169248).

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

81386432 is a wasteful number, since it uses less digits than its factorization.

81386432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16188 (or 16178 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 81386432 is about 9021.4429001130. The cubic root of 81386432 is about 433.3618432261.

It can be divided in two parts, 81386 and 432, that added together give a palindrome (81818).

The spelling of 81386432 in words is "eighty-one million, three hundred eighty-six thousand, four hundred thirty-two".