9897999972 has 24 divisors (see below), whose sum is σ = 26394666816. Its totient is φ = 2827999968.

The previous prime is 9897999967. The next prime is 9898000043. The reversal of 9897999972 is 2799997989.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58916583 + ... + 58916750.

It is an arithmetic number, because the mean of its divisors is an integer number (1099777784).

Almost surely, 2^9897999972 is an apocalyptic number.

It is an amenable number.

9897999972 is an abundant number, since it is smaller than the sum of its proper divisors (16496666844).

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

9897999972 is a wasteful number, since it uses less digits than its factorization.

9897999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117833347 (or 117833345 counting only the distinct ones).

The product of its digits is 416649744, while the sum is 78.

The square root of 9897999972 is about 99488.6926841438. The cubic root of 9897999972 is about 2147.0845626994.

The spelling of 9897999972 in words is "nine billion, eight hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred seventy-two".