87639975 has 60 divisors (see below), whose sum is σ = 164203776. Its totient is φ = 46206720.

The previous prime is 87639973. The next prime is 87639983. The reversal of 87639975 is 57993678.

It is not a de Polignac number, because 87639975 - 2¹ = 87639973 is a prime.

Its product of digits (2857680) is a multiple of the sum of its prime divisors (504).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87639973) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 228634 + ... + 229016.

Almost surely, 2^87639975 is an apocalyptic number.

87639975 is a deficient number, since it is larger than the sum of its proper divisors (76563801).

87639975 is a wasteful number, since it uses less digits than its factorization.

87639975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 504 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 87639975 is about 9361.6224555362. The cubic root of 87639975 is about 444.1886068681.

The spelling of 87639975 in words is "eighty-seven million, six hundred thirty-nine thousand, nine hundred seventy-five".