99999975 has 48 divisors (see below), whose sum is σ = 178560000. Its totient is φ = 49230720.

The previous prime is 99999971. The next prime is 99999989. The reversal of 99999975 is 57999999.

It is not a de Polignac number, because 99999975 - 2² = 99999971 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49026 + ... + 51024.

It is an arithmetic number, because the mean of its divisors is an integer number (3720000).

Almost surely, 2^99999975 is an apocalyptic number.

99999975 is a deficient number, since it is larger than the sum of its proper divisors (78560025).

99999975 is a wasteful number, since it uses less digits than its factorization.

99999975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064 (or 2059 counting only the distinct ones).

The product of its digits is 18600435, while the sum is 66.

The square root of 99999975 is about 9999.9987499999. The cubic root of 99999975 is about 464.1588446814.

The spelling of 99999975 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-five".