99975 has 24 divisors (see below), whose sum is σ = 174592. Its totient is φ = 50400.

The previous prime is 99971. The next prime is 99989. The reversal of 99975 is 57999.

It is not a de Polignac number, because 99975 - 2² = 99971 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2304 + ... + 2346.

2⁹⁹⁹⁷⁵ is an apocalyptic number.

99975 is a deficient number, since it is larger than the sum of its proper divisors (74617).

99975 is a wasteful number, since it uses less digits than its factorization.

99975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 82 counting only the distinct ones).

The product of its digits is 25515, while the sum is 39.

The square root of 99975 is about 316.1882350752. The cubic root of 99975 is about 46.4120200231.

The spelling of 99975 in words is "ninety-nine thousand, nine hundred seventy-five".