87638670 has 48 divisors (see below), whose sum is σ = 260413920. Its totient is φ = 20031552.

The previous prime is 87638669. The next prime is 87638693. The reversal of 87638670 is 7683678.

87638670 is a `hidden beast` number, since 8 + 7 + 638 + 6 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68925 + ... + 70184.

It is an arithmetic number, because the mean of its divisors is an integer number (5425290).

Almost surely, 2^87638670 is an apocalyptic number.

87638670 is an abundant number, since it is smaller than the sum of its proper divisors (172775250).

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

87638670 is a wasteful number, since it uses less digits than its factorization.

87638670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139129 (or 139126 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 87638670 is about 9361.5527558199. The cubic root of 87638670 is about 444.1864021322.

The spelling of 87638670 in words is "eighty-seven million, six hundred thirty-eight thousand, six hundred seventy".