37664421 has 16 divisors (see below), whose sum is σ = 51019584. Its totient is φ = 24712704.

The previous prime is 37664381. The next prime is 37664443. The reversal of 37664421 is 12446673.

It is a happy number.

It is not a de Polignac number, because 37664421 - 2¹⁵ = 37631653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37664461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100791 + ... + 101163.

It is an arithmetic number, because the mean of its divisors is an integer number (3188724).

Almost surely, 2^37664421 is an apocalyptic number.

It is an amenable number.

37664421 is a deficient number, since it is larger than the sum of its proper divisors (13355163).

37664421 is a wasteful number, since it uses less digits than its factorization.

37664421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820.

The product of its digits is 24192, while the sum is 33.

The square root of 37664421 is about 6137.1345919737. The cubic root of 37664421 is about 335.2049566322.

The spelling of 37664421 in words is "thirty-seven million, six hundred sixty-four thousand, four hundred twenty-one".