640826414 has 32 divisors (see below), whose sum is σ = 1059367680. Its totient is φ = 289377792.

The previous prime is 640826399. The next prime is 640826447. The reversal of 640826414 is 414628046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302222 + ... + 304334.

It is an arithmetic number, because the mean of its divisors is an integer number (33105240).

Almost surely, 2^640826414 is an apocalyptic number.

640826414 is a deficient number, since it is larger than the sum of its proper divisors (418541266).

640826414 is a wasteful number, since it uses less digits than its factorization.

640826414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 640826414 is about 25314.5494528344. The cubic root of 640826414 is about 862.1446445937.

The spelling of 640826414 in words is "six hundred forty million, eight hundred twenty-six thousand, four hundred fourteen".