87139882 has 4 divisors (see below), whose sum is σ = 130709826. Its totient is φ = 43569940.

The previous prime is 87139879. The next prime is 87139919. The reversal of 87139882 is 28893178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 79405921 + 7733961 = 8911^2 + 2781^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21784969 + ... + 21784972.

Almost surely, 2^87139882 is an apocalyptic number.

87139882 is a deficient number, since it is larger than the sum of its proper divisors (43569944).

87139882 is a wasteful number, since it uses less digits than its factorization.

87139882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43569943.

The product of its digits is 193536, while the sum is 46.

The square root of 87139882 is about 9334.8745037092. The cubic root of 87139882 is about 443.3421153906.

The spelling of 87139882 in words is "eighty-seven million, one hundred thirty-nine thousand, eight hundred eighty-two".