97639992 has 80 divisors (see below), whose sum is σ = 278740440. Its totient is φ = 31921344.

The previous prime is 97639979. The next prime is 97639999. The reversal of 97639992 is 29993679.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97639999) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32923 + ... + 35765.

Almost surely, 2^97639992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97639992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139370220).

97639992 is an abundant number, since it is smaller than the sum of its proper divisors (181100448).

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

97639992 is a wasteful number, since it uses less digits than its factorization.

97639992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914 (or 2901 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 54.

The square root of 97639992 is about 9881.2950568233. The cubic root of 97639992 is about 460.4783807185.

The spelling of 97639992 in words is "ninety-seven million, six hundred thirty-nine thousand, nine hundred ninety-two".