99642015 has 64 divisors (see below), whose sum is σ = 204664320. Its totient is φ = 45457920.

The previous prime is 99642001. The next prime is 99642043. The reversal of 99642015 is 51024699.

99642015 is a `hidden beast` number, since 9 + 9 + 642 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 99642015 - 2¹⁶ = 99576479 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23272 + ... + 27218.

It is an arithmetic number, because the mean of its divisors is an integer number (3197880).

Almost surely, 2^99642015 is an apocalyptic number.

99642015 is an abundant number, since it is smaller than the sum of its proper divisors (105022305).

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

99642015 is a wasteful number, since it uses less digits than its factorization.

99642015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989 (or 3983 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 99642015 is about 9982.0847021051. The cubic root of 99642015 is about 463.6043480567.

The spelling of 99642015 in words is "ninety-nine million, six hundred forty-two thousand, fifteen".