87447872 has 28 divisors (see below), whose sum is σ = 178224180. Its totient is φ = 42541056.

The previous prime is 87447859. The next prime is 87447907. The reversal of 87447872 is 27874478.

It can be written as a sum of positive squares in 2 ways, for example, as 71639296 + 15808576 = 8464^2 + 3976^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16097 + ... + 20832.

Almost surely, 2^87447872 is an apocalyptic number.

It is an amenable number.

87447872 is an abundant number, since it is smaller than the sum of its proper divisors (90776308).

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

87447872 is a wasteful number, since it uses less digits than its factorization.

87447872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36978 (or 36968 counting only the distinct ones).

The product of its digits is 702464, while the sum is 47.

The square root of 87447872 is about 9351.3566930152. The cubic root of 87447872 is about 443.8638221014.

The spelling of 87447872 in words is "eighty-seven million, four hundred forty-seven thousand, eight hundred seventy-two".