87905556 has 72 divisors (see below), whose sum is σ = 227287424. Its totient is φ = 28641600.

The previous prime is 87905551. The next prime is 87905561. The reversal of 87905556 is 65550978.

87905556 is a `hidden beast` number, since 8 + 7 + 90 + 5 + 556 = 666.

It is an interprime number because it is at equal distance from previous prime (87905551) and next prime (87905561).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87905551) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 559830 + ... + 559986.

Almost surely, 2^87905556 is an apocalyptic number.

It is an amenable number.

87905556 is an abundant number, since it is smaller than the sum of its proper divisors (139381868).

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

87905556 is a wasteful number, since it uses less digits than its factorization.

87905556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 87905556 is about 9375.7962861828. The cubic root of 87905556 is about 444.6368387492.

The spelling of 87905556 in words is "eighty-seven million, nine hundred five thousand, five hundred fifty-six".