87639638 has 8 divisors (see below), whose sum is σ = 131566080. Its totient is φ = 43784280.

The previous prime is 87639613. The next prime is 87639649. The reversal of 87639638 is 83693678.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×87639638² = 15361412297542088, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 14573 + ... + 19688.

It is an arithmetic number, because the mean of its divisors is an integer number (16445760).

Almost surely, 2^87639638 is an apocalyptic number.

87639638 is a deficient number, since it is larger than the sum of its proper divisors (43926442).

87639638 is a wasteful number, since it uses less digits than its factorization.

87639638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35542.

The product of its digits is 1306368, while the sum is 50.

The square root of 87639638 is about 9361.6044565021. The cubic root of 87639638 is about 444.1880375246.

The spelling of 87639638 in words is "eighty-seven million, six hundred thirty-nine thousand, six hundred thirty-eight".