997638008 has 16 divisors (see below), whose sum is σ = 1871306280. Its totient is φ = 498623008.

The previous prime is 997638007. The next prime is 997638011. The reversal of 997638008 is 800836799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997638007) 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, 1610 + ... + 44697.

Almost surely, 2^997638008 is an apocalyptic number.

It is an amenable number.

997638008 is a deficient number, since it is larger than the sum of its proper divisors (873668272).

997638008 is a wasteful number, since it uses less digits than its factorization.

997638008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49006 (or 49002 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 997638008 is about 31585.4081499670. The cubic root of 997638008 is about 999.2120486290.

The spelling of 997638008 in words is "nine hundred ninety-seven million, six hundred thirty-eight thousand, eight".