640100624 has 20 divisors (see below), whose sum is σ = 1240825344. Its totient is φ = 319887648.

The previous prime is 640100621. The next prime is 640100639. The reversal of 640100624 is 426001046.

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 640100624.

It is not an unprimeable number, because it can be changed into a prime (640100621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26249 + ... + 44375.

Almost surely, 2^640100624 is an apocalyptic number.

It is an amenable number.

640100624 is a deficient number, since it is larger than the sum of its proper divisors (600724720).

640100624 is a wasteful number, since it uses less digits than its factorization.

640100624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20342 (or 20336 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 640100624 is about 25300.2099596031. The cubic root of 640100624 is about 861.8190377785.

The spelling of 640100624 in words is "six hundred forty million, one hundred thousand, six hundred twenty-four".