87428556 has 36 divisors (see below), whose sum is σ = 228131904. Its totient is φ = 28202400.

The previous prime is 87428513. The next prime is 87428567. The reversal of 87428556 is 65582478.

87428556 is a `hidden beast` number, since 8 + 74 + 28 + 556 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38055 + ... + 40286.

Almost surely, 2^87428556 is an apocalyptic number.

It is an amenable number.

87428556 is an abundant number, since it is smaller than the sum of its proper divisors (140703348).

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

87428556 is a wasteful number, since it uses less digits than its factorization.

87428556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78382 (or 78377 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 87428556 is about 9350.3238446591. The cubic root of 87428556 is about 443.8311386115.

The spelling of 87428556 in words is "eighty-seven million, four hundred twenty-eight thousand, five hundred fifty-six".