640941744 has 40 divisors (see below), whose sum is σ = 1742914240. Its totient is φ = 202402368.

The previous prime is 640941739. The next prime is 640941751. The reversal of 640941744 is 447149046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350482 + ... + 352305.

It is an arithmetic number, because the mean of its divisors is an integer number (43572856).

Almost surely, 2^640941744 is an apocalyptic number.

It is an amenable number.

640941744 is an abundant number, since it is smaller than the sum of its proper divisors (1101972496).

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

640941744 is a wasteful number, since it uses less digits than its factorization.

640941744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702817 (or 702811 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 640941744 is about 25316.8272893742. The cubic root of 640941744 is about 862.1963617595.

The spelling of 640941744 in words is "six hundred forty million, nine hundred forty-one thousand, seven hundred forty-four".