87139497636 has 27 divisors (see below), whose sum is σ = 220273762891. Its totient is φ = 29045908824.

The previous prime is 87139497629. The next prime is 87139497637. The reversal of 87139497636 is 63679493178.

The square root of 87139497636 is 295194.

It is a perfect power (a square), and thus also a powerful number.

87139497636 is a `hidden beast` number, since 8 + 7 + 139 + 497 + 6 + 3 + 6 = 666.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87139497637) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1746565 + ... + 1795763.

Almost surely, 2^87139497636 is an apocalyptic number.

87139497636 is the 295194-th square number.

It is an amenable number.

87139497636 is an abundant number, since it is smaller than the sum of its proper divisors (133134265255).

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

87139497636 is an frugal number, since it uses more digits than its factorization.

87139497636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98408 (or 49204 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 63.

The spelling of 87139497636 in words is "eighty-seven billion, one hundred thirty-nine million, four hundred ninety-seven thousand, six hundred thirty-six".