37664987 has 4 divisors (see below), whose sum is σ = 37914576. Its totient is φ = 37415400.

The previous prime is 37664983. The next prime is 37664993. The reversal of 37664987 is 78946673.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78946673 = 13 ⋅6072821.

It is a cyclic number.

It is not a de Polignac number, because 37664987 - 2² = 37664983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37664981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124568 + ... + 124869.

It is an arithmetic number, because the mean of its divisors is an integer number (9478644).

Almost surely, 2^37664987 is an apocalyptic number.

37664987 is a deficient number, since it is larger than the sum of its proper divisors (249589).

37664987 is a wasteful number, since it uses less digits than its factorization.

37664987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249588.

The product of its digits is 1524096, while the sum is 50.

The square root of 37664987 is about 6137.1807045255. The cubic root of 37664987 is about 335.2066357151.

The spelling of 37664987 in words is "thirty-seven million, six hundred sixty-four thousand, nine hundred eighty-seven".