87639556 has 12 divisors (see below), whose sum is σ = 162391068. Its totient is φ = 41242112.

The previous prime is 87639553. The next prime is 87639557. The reversal of 87639556 is 65593678.

It can be written as a sum of positive squares in 2 ways, for example, as 31539456 + 56100100 = 5616^2 + 7490^2 .

It is not an unprimeable number, because it can be changed into a prime (87639553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644341 + ... + 644476.

It is an arithmetic number, because the mean of its divisors is an integer number (13532589).

Almost surely, 2^87639556 is an apocalyptic number.

It is an amenable number.

87639556 is a deficient number, since it is larger than the sum of its proper divisors (74751512).

87639556 is a wasteful number, since it uses less digits than its factorization.

87639556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288838 (or 1288836 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

The square root of 87639556 is about 9361.6000769099. The cubic root of 87639556 is about 444.1878989898.

Adding to 87639556 its product of digits (1360800), we get a square (89000356 = 9434²).

The spelling of 87639556 in words is "eighty-seven million, six hundred thirty-nine thousand, five hundred fifty-six".