89731638 has 24 divisors (see below), whose sum is σ = 201620328. Its totient is φ = 29910384.

The previous prime is 89731619. The next prime is 89731651. The reversal of 89731638 is 83613798.

It is a happy number.

89731638 is a `hidden beast` number, since 8 + 9 + 7 + 3 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 89731593 and 89731602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91831 + ... + 92802.

It is an arithmetic number, because the mean of its divisors is an integer number (8400847).

Almost surely, 2^89731638 is an apocalyptic number.

89731638 is an abundant number, since it is smaller than the sum of its proper divisors (111888690).

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

89731638 is a wasteful number, since it uses less digits than its factorization.

89731638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184650 (or 184638 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 89731638 is about 9472.6785018811. The cubic root of 89731638 is about 447.6946094456.

The spelling of 89731638 in words is "eighty-nine million, seven hundred thirty-one thousand, six hundred thirty-eight".