87117880 has 32 divisors (see below), whose sum is σ = 196574400. Its totient is φ = 34747776.

The previous prime is 87117857. The next prime is 87117893. The reversal of 87117880 is 8871178.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12001 + ... + 17839.

It is an arithmetic number, because the mean of its divisors is an integer number (6142950).

Almost surely, 2^87117880 is an apocalyptic number.

It is an amenable number.

87117880 is an abundant number, since it is smaller than the sum of its proper divisors (109456520).

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

87117880 is a wasteful number, since it uses less digits than its factorization.

87117880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6223 (or 6219 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 87117880 is about 9333.6959453370. The cubic root of 87117880 is about 443.3047990127.

The spelling of 87117880 in words is "eighty-seven million, one hundred seventeen thousand, eight hundred eighty".