87123556 has 27 divisors (see below), whose sum is σ = 165557721. Its totient is φ = 40098864.

The previous prime is 87123541. The next prime is 87123559. The reversal of 87123556 is 65532178.

The square root of 87123556 is 9334.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 74235456 = 3590^2 + 8616^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87123559) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 242505 + ... + 242863.

Almost surely, 2^87123556 is an apocalyptic number.

87123556 is the 9334-th square number.

It is an amenable number.

87123556 is a deficient number, since it is larger than the sum of its proper divisors (78434165).

87123556 is a wasteful number, since it uses less digits than its factorization.

87123556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 374 counting only the distinct ones).

The product of its digits is 50400, while the sum is 37.

The cubic root of 87123556 is about 443.3144263644.

The spelling of 87123556 in words is "eighty-seven million, one hundred twenty-three thousand, five hundred fifty-six".