99679978 has 8 divisors (see below), whose sum is σ = 151971300. Its totient is φ = 49022880.

The previous prime is 99679939. The next prime is 99679981. The reversal of 99679978 is 87997699.

It can be written as a sum of positive squares in 2 ways, for example, as 99261369 + 418609 = 9963^2 + 647^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 408403 + ... + 408646.

Almost surely, 2^99679978 is an apocalyptic number.

99679978 is a deficient number, since it is larger than the sum of its proper divisors (52291322).

99679978 is a wasteful number, since it uses less digits than its factorization.

99679978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817112.

The product of its digits is 15431472, while the sum is 64.

The square root of 99679978 is about 9983.9860777147. The cubic root of 99679978 is about 463.6632173907.

The spelling of 99679978 in words is "ninety-nine million, six hundred seventy-nine thousand, nine hundred seventy-eight".