64004137 has 4 divisors (see below), whose sum is σ = 64880980. Its totient is φ = 63127296.

The previous prime is 64004123. The next prime is 64004153. The reversal of 64004137 is 73140046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 25613721 = 6196^2 + 5061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64004137 is a prime.

It is a super-2 number, since 2×64004137² = 8193059106229538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64001137) 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, 438312 + ... + 438457.

It is an arithmetic number, because the mean of its divisors is an integer number (16220245).

Almost surely, 2^64004137 is an apocalyptic number.

It is an amenable number.

64004137 is a deficient number, since it is larger than the sum of its proper divisors (876843).

64004137 is an equidigital number, since it uses as much as digits as its factorization.

64004137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876842.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 64004137 is about 8000.2585583217. The cubic root of 64004137 is about 400.0086185643.

The spelling of 64004137 in words is "sixty-four million, four thousand, one hundred thirty-seven".