87220656 has 60 divisors (see below), whose sum is σ = 244807992. Its totient is φ = 28988928.

The previous prime is 87220649. The next prime is 87220657. The reversal of 87220656 is 65602278.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 87220656.

It is not an unprimeable number, because it can be changed into a prime (87220657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66600 + ... + 67896.

Almost surely, 2^87220656 is an apocalyptic number.

It is an amenable number.

87220656 is an abundant number, since it is smaller than the sum of its proper divisors (157587336).

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

87220656 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (87220655) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1778).

87220656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 87220656 is about 9339.1999657358. The cubic root of 87220656 is about 443.4790578793.

It can be divided in two parts, 872 and 20656, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 87220656 in words is "eighty-seven million, two hundred twenty thousand, six hundred fifty-six".