87581660 has 12 divisors (see below), whose sum is σ = 183921528. Its totient is φ = 35032656.

The previous prime is 87581651. The next prime is 87581687. The reversal of 87581660 is 6618578.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2189522 + ... + 2189561.

It is an arithmetic number, because the mean of its divisors is an integer number (15326794).

Almost surely, 2^87581660 is an apocalyptic number.

It is an amenable number.

87581660 is an abundant number, since it is smaller than the sum of its proper divisors (96339868).

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

87581660 is a wasteful number, since it uses less digits than its factorization.

87581660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379092 (or 4379090 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 87581660 is about 9358.5073596167. The cubic root of 87581660 is about 444.0900650557.

The spelling of 87581660 in words is "eighty-seven million, five hundred eighty-one thousand, six hundred sixty".