997638724 has 12 divisors (see below), whose sum is σ = 1749370000. Its totient is φ = 497818728.

The previous prime is 997638701. The next prime is 997638737. The reversal of 997638724 is 427836799.

997638724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 247914 + ... + 251905.

Almost surely, 2^997638724 is an apocalyptic number.

It is an amenable number.

997638724 is a deficient number, since it is larger than the sum of its proper divisors (751731276).

997638724 is a wasteful number, since it uses less digits than its factorization.

997638724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500322 (or 500320 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 55.

The square root of 997638724 is about 31585.4194843127. The cubic root of 997638724 is about 999.2122876722.

The spelling of 997638724 in words is "nine hundred ninety-seven million, six hundred thirty-eight thousand, seven hundred twenty-four".