640368294 has 16 divisors (see below), whose sum is σ = 1283288832. Its totient is φ = 213030728.

The previous prime is 640368293. The next prime is 640368307. The reversal of 640368294 is 492863046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640368293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103074 + ... + 109109.

It is an arithmetic number, because the mean of its divisors is an integer number (80205552).

Almost surely, 2^640368294 is an apocalyptic number.

640368294 is an abundant number, since it is smaller than the sum of its proper divisors (642920538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640368294 is a wasteful number, since it uses less digits than its factorization.

640368294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212691.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 640368294 is about 25305.4992837525. The cubic root of 640368294 is about 861.9391495994.

The spelling of 640368294 in words is "six hundred forty million, three hundred sixty-eight thousand, two hundred ninety-four".