99645975 has 144 divisors (see below), whose sum is σ = 222069120. Its totient is φ = 41990400.

The previous prime is 99645967. The next prime is 99646003. The reversal of 99645975 is 57954699.

It is not a de Polignac number, because 99645975 - 2³ = 99645967 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 611244 + ... + 611406.

Almost surely, 2^99645975 is an apocalyptic number.

99645975 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99645975 is an abundant number, since it is smaller than the sum of its proper divisors (122423145).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99645975 is a wasteful number, since it uses less digits than its factorization.

99645975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 214 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 54.

The square root of 99645975 is about 9982.2830554939. The cubic root of 99645975 is about 463.6104895386.

It can be divided in two parts, 996 and 45975, that added together give a triangular number (46971 = T₃₀₆).

The spelling of 99645975 in words is "ninety-nine million, six hundred forty-five thousand, nine hundred seventy-five".