81969432 has 16 divisors (see below), whose sum is σ = 204923640. Its totient is φ = 27323136.

The previous prime is 81969367. The next prime is 81969443. The reversal of 81969432 is 23496918.

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, 1707673 + ... + 1707720.

Almost surely, 2^81969432 is an apocalyptic number.

It is an amenable number.

81969432 is an abundant number, since it is smaller than the sum of its proper divisors (122954208).

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

81969432 is a wasteful number, since it uses less digits than its factorization.

81969432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415402 (or 3415398 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 81969432 is about 9053.6971453655. The cubic root of 81969432 is about 434.3941572698.

The spelling of 81969432 in words is "eighty-one million, nine hundred sixty-nine thousand, four hundred thirty-two".