640436621324 has 96 divisors (see below), whose sum is σ = 1216939852800. Its totient is φ = 293946624000.

The previous prime is 640436621269. The next prime is 640436621369. The reversal of 640436621324 is 423126634046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155104892 + ... + 155109020.

It is an arithmetic number, because the mean of its divisors is an integer number (12676456800).

Almost surely, 2^640436621324 is an apocalyptic number.

It is an amenable number.

640436621324 is a deficient number, since it is larger than the sum of its proper divisors (576503231476).

640436621324 is a wasteful number, since it uses less digits than its factorization.

640436621324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623 (or 4621 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 640436621324 in words is "six hundred forty billion, four hundred thirty-six million, six hundred twenty-one thousand, three hundred twenty-four".