640294037 has 8 divisors (see below), whose sum is σ = 656683104. Its totient is φ = 623973168.

The previous prime is 640294021. The next prime is 640294043. The reversal of 640294037 is 730492046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640294037 - 2⁴ = 640294021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640293988 and 640294006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640294097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2243 + ... + 35855.

It is an arithmetic number, because the mean of its divisors is an integer number (82085388).

Almost surely, 2^640294037 is an apocalyptic number.

It is an amenable number.

640294037 is a deficient number, since it is larger than the sum of its proper divisors (16389067).

640294037 is a wasteful number, since it uses less digits than its factorization.

640294037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34099.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 640294037 is about 25304.0320304887. The cubic root of 640294037 is about 861.9058315384.

The spelling of 640294037 in words is "six hundred forty million, two hundred ninety-four thousand, thirty-seven".