99997898 has 64 divisors (see below), whose sum is σ = 203212800. Its totient is φ = 35640000.

The previous prime is 99997897. The next prime is 99997901. The reversal of 99997898 is 89879999.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99997897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 398273 + ... + 398523.

It is an arithmetic number, because the mean of its divisors is an integer number (3175200).

Almost surely, 2^99997898 is an apocalyptic number.

99997898 is an abundant number, since it is smaller than the sum of its proper divisors (103214902).

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

99997898 is a wasteful number, since it uses less digits than its factorization.

99997898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483.

The product of its digits is 26453952, while the sum is 68.

The square root of 99997898 is about 9999.8948994477. The cubic root of 99997898 is about 464.1556311319.

The spelling of 99997898 in words is "ninety-nine million, nine hundred ninety-seven thousand, eight hundred ninety-eight".