87664137 has 48 divisors (see below), whose sum is σ = 135366336. Its totient is φ = 50371200.

The previous prime is 87664133. The next prime is 87664139. The reversal of 87664137 is 73146678.

It is not a de Polignac number, because 87664137 - 2² = 87664133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87664133) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 819238 + ... + 819344.

It is an arithmetic number, because the mean of its divisors is an integer number (2820132).

Almost surely, 2^87664137 is an apocalyptic number.

It is an amenable number.

87664137 is a deficient number, since it is larger than the sum of its proper divisors (47702199).

87664137 is a wasteful number, since it uses less digits than its factorization.

87664137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 219 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 87664137 is about 9362.9128480404. The cubic root of 87664137 is about 444.2294234740.

It can be divided in two parts, 876641 and 37, that added together give a palindrome (876678).

The spelling of 87664137 in words is "eighty-seven million, six hundred sixty-four thousand, one hundred thirty-seven".