87188138 has 16 divisors (see below), whose sum is σ = 140036040. Its totient is φ = 40567296.

The previous prime is 87188117. The next prime is 87188141. The reversal of 87188138 is 83188178.

It can be written as a sum of positive squares in 4 ways, for example, as 59552089 + 27636049 = 7717^2 + 5257^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11381 + ... + 17432.

Almost surely, 2^87188138 is an apocalyptic number.

87188138 is a deficient number, since it is larger than the sum of its proper divisors (52847902).

87188138 is a wasteful number, since it uses less digits than its factorization.

87188138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28921.

The product of its digits is 86016, while the sum is 44.

The square root of 87188138 is about 9337.4588620245. The cubic root of 87188138 is about 443.4239377384.

The spelling of 87188138 in words is "eighty-seven million, one hundred eighty-eight thousand, one hundred thirty-eight".