99978164 has 48 divisors (see below), whose sum is σ = 206618496. Its totient is φ = 41731200.

The previous prime is 99978161. The next prime is 99978187. The reversal of 99978164 is 46187999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99978161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158129 + ... + 158759.

It is an arithmetic number, because the mean of its divisors is an integer number (4304552).

Almost surely, 2^99978164 is an apocalyptic number.

It is an amenable number.

99978164 is an abundant number, since it is smaller than the sum of its proper divisors (106640332).

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

99978164 is a wasteful number, since it uses less digits than its factorization.

99978164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 934 counting only the distinct ones).

The product of its digits is 979776, while the sum is 53.

The square root of 99978164 is about 9998.9081403921. The cubic root of 99978164 is about 464.1250963240.

The spelling of 99978164 in words is "ninety-nine million, nine hundred seventy-eight thousand, one hundred sixty-four".