640700037 has 20 divisors (see below), whose sum is σ = 958563936. Its totient is φ = 426477960.

The previous prime is 640700003. The next prime is 640700041. The reversal of 640700037 is 730007046.

It is not a de Polignac number, because 640700037 - 2⁶ = 640699973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640700077) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 50248 + ... + 61694.

Almost surely, 2^640700037 is an apocalyptic number.

It is an amenable number.

640700037 is a deficient number, since it is larger than the sum of its proper divisors (317863899).

640700037 is a wasteful number, since it uses less digits than its factorization.

640700037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12150 (or 12141 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 640700037 is about 25312.0531960566. The cubic root of 640700037 is about 862.0879665218.

The spelling of 640700037 in words is "six hundred forty million, seven hundred thousand, thirty-seven".