640375796 has 24 divisors (see below), whose sum is σ = 1163457120. Its totient is φ = 308038752.

The previous prime is 640375787. The next prime is 640375837. The reversal of 640375796 is 697573046.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 640375796.

It is a congruent number.

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, 23075 + ... + 42581.

It is an arithmetic number, because the mean of its divisors is an integer number (48477380).

Almost surely, 2^640375796 is an apocalyptic number.

It is an amenable number.

640375796 is a deficient number, since it is larger than the sum of its proper divisors (523081324).

640375796 is a wasteful number, since it uses less digits than its factorization.

640375796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19823 (or 19821 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 47.

The square root of 640375796 is about 25305.6475119685. The cubic root of 640375796 is about 861.9425154970.

The spelling of 640375796 in words is "six hundred forty million, three hundred seventy-five thousand, seven hundred ninety-six".