81889232 has 20 divisors (see below), whose sum is σ = 158893476. Its totient is φ = 40884480.

The previous prime is 81889231. The next prime is 81889253. The reversal of 81889232 is 23298818.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58308496 + 23580736 = 7636^2 + 4856^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81889232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81889231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8732 + ... + 15492.

Almost surely, 2^81889232 is an apocalyptic number.

It is an amenable number.

81889232 is a deficient number, since it is larger than the sum of its proper divisors (77004244).

81889232 is a wasteful number, since it uses less digits than its factorization.

81889232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7526 (or 7520 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 81889232 is about 9049.2669316360. The cubic root of 81889232 is about 434.2524386686.

The spelling of 81889232 in words is "eighty-one million, eight hundred eighty-nine thousand, two hundred thirty-two".