87978664 has 32 divisors (see below), whose sum is σ = 174600000. Its totient is φ = 41444352.

The previous prime is 87978659. The next prime is 87978677. The reversal of 87978664 is 46687978.

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, 27837 + ... + 30835.

It is an arithmetic number, because the mean of its divisors is an integer number (5456250).

Almost surely, 2^87978664 is an apocalyptic number.

It is an amenable number.

87978664 is a deficient number, since it is larger than the sum of its proper divisors (86621336).

87978664 is a wasteful number, since it uses less digits than its factorization.

87978664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217 (or 3213 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 55.

The square root of 87978664 is about 9379.6942380869. The cubic root of 87978664 is about 444.7600676028.

The spelling of 87978664 in words is "eighty-seven million, nine hundred seventy-eight thousand, six hundred sixty-four".