640355914 has 16 divisors (see below), whose sum is σ = 1072225440. Its totient is φ = 284301360.

The previous prime is 640355899. The next prime is 640355923. The reversal of 640355914 is 419553046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337509 + ... + 339400.

It is an arithmetic number, because the mean of its divisors is an integer number (67014090).

Almost surely, 2^640355914 is an apocalyptic number.

640355914 is a deficient number, since it is larger than the sum of its proper divisors (431869526).

640355914 is a wasteful number, since it uses less digits than its factorization.

640355914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676965.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 640355914 is about 25305.2546717080. The cubic root of 640355914 is about 861.9335950482.

The spelling of 640355914 in words is "six hundred forty million, three hundred fifty-five thousand, nine hundred fourteen".