99925978 has 16 divisors (see below), whose sum is σ = 158058720. Its totient is φ = 47249136.

The previous prime is 99925957. The next prime is 99925993. The reversal of 99925978 is 87952999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22801 + ... + 26827.

It is an arithmetic number, because the mean of its divisors is an integer number (9878670).

Almost surely, 2^99925978 is an apocalyptic number.

99925978 is a deficient number, since it is larger than the sum of its proper divisors (58132742).

99925978 is a wasteful number, since it uses less digits than its factorization.

99925978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701.

The product of its digits is 3674160, while the sum is 58.

The square root of 99925978 is about 9996.2982148393. The cubic root of 99925978 is about 464.0443285285.

The spelling of 99925978 in words is "ninety-nine million, nine hundred twenty-five thousand, nine hundred seventy-eight".