87139375 has 10 divisors (see below), whose sum is σ = 108890144. Its totient is φ = 69711000.

The previous prime is 87139369. The next prime is 87139417. The reversal of 87139375 is 57393178.

It is not a de Polignac number, because 87139375 - 2¹¹ = 87137327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 69087 + ... + 70336.

Almost surely, 2^87139375 is an apocalyptic number.

87139375 is a deficient number, since it is larger than the sum of its proper divisors (21750769).

87139375 is an equidigital number, since it uses as much as digits as its factorization.

87139375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139443 (or 139428 counting only the distinct ones).

The product of its digits is 158760, while the sum is 43.

The square root of 87139375 is about 9334.8473474396. The cubic root of 87139375 is about 443.3412555666.

The spelling of 87139375 in words is "eighty-seven million, one hundred thirty-nine thousand, three hundred seventy-five".