99997975 has 72 divisors (see below), whose sum is σ = 162083376. Its totient is φ = 60480000.

The previous prime is 99997973. The next prime is 99997981. The reversal of 99997975 is 57979999.

99997975 = 186³ + 187³ + ... + 199³.

It is not a de Polignac number, because 99997975 - 2¹ = 99997973 is a prime.

Its product of digits (14467005) is a multiple of the sum of its prime divisors (245).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997973) 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 71 ways as a sum of consecutive naturals, for example, 552385 + ... + 552565.

It is an arithmetic number, because the mean of its divisors is an integer number (2251158).

Almost surely, 2^99997975 is an apocalyptic number.

99997975 is a deficient number, since it is larger than the sum of its proper divisors (62085401).

99997975 is a wasteful number, since it uses less digits than its factorization.

99997975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 245 counting only the distinct ones).

The product of its digits is 14467005, while the sum is 64.

The square root of 99997975 is about 9999.8987494874. The cubic root of 99997975 is about 464.1557502677.

The spelling of 99997975 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred seventy-five".