99987537 has 16 divisors (see below), whose sum is σ = 144048128. Its totient is φ = 61326720.

The previous prime is 99987529. The next prime is 99987539. The reversal of 99987537 is 73578999.

It is not a de Polignac number, because 99987537 - 2³ = 99987529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99987539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8112 + ... + 16302.

It is an arithmetic number, because the mean of its divisors is an integer number (9003008).

Almost surely, 2^99987537 is an apocalyptic number.

It is an amenable number.

99987537 is a deficient number, since it is larger than the sum of its proper divisors (44060591).

99987537 is a wasteful number, since it uses less digits than its factorization.

99987537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520.

The product of its digits is 4286520, while the sum is 57.

The square root of 99987537 is about 9999.3768305830. The cubic root of 99987537 is about 464.1395998529.

The spelling of 99987537 in words is "ninety-nine million, nine hundred eighty-seven thousand, five hundred thirty-seven".