640348982 has 64 divisors (see below), whose sum is σ = 1250726400. Its totient is φ = 238775040.

The previous prime is 640348967. The next prime is 640348997. The reversal of 640348982 is 289843046.

It is an interprime number because it is at equal distance from previous prime (640348967) and next prime (640348997).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 971369 + ... + 972027.

It is an arithmetic number, because the mean of its divisors is an integer number (19542600).

Almost surely, 2^640348982 is an apocalyptic number.

640348982 is a deficient number, since it is larger than the sum of its proper divisors (610377418).

640348982 is a wasteful number, since it uses less digits than its factorization.

640348982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 640348982 is about 25305.1177037373. The cubic root of 640348982 is about 861.9304848272.

The spelling of 640348982 in words is "six hundred forty million, three hundred forty-eight thousand, nine hundred eighty-two".