99879975 has 36 divisors (see below), whose sum is σ = 192663016. Its totient is φ = 49170240.

The previous prime is 99879971. The next prime is 99879991. The reversal of 99879975 is 57997899.

It is not a de Polignac number, because 99879975 - 2² = 99879971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99879971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14149 + ... + 19998.

Almost surely, 2^99879975 is an apocalyptic number.

99879975 is a deficient number, since it is larger than the sum of its proper divisors (92783041).

99879975 is a wasteful number, since it uses less digits than its factorization.

99879975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34176 (or 34168 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 63.

The square root of 99879975 is about 9993.9969481684. The cubic root of 99879975 is about 463.9731067821.

The spelling of 99879975 in words is "ninety-nine million, eight hundred seventy-nine thousand, nine hundred seventy-five".