640225870044 has 24 divisors (see below), whose sum is σ = 1496485793040. Its totient is φ = 213033561984.

The previous prime is 640225870033. The next prime is 640225870073. The reversal of 640225870044 is 440078522046.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 640225869978 and 640225870005.

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, 46875559 + ... + 46889214.

It is an arithmetic number, because the mean of its divisors is an integer number (62353574710).

Almost surely, 2^640225870044 is an apocalyptic number.

It is an amenable number.

640225870044 is an abundant number, since it is smaller than the sum of its proper divisors (856259922996).

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

640225870044 is a wasteful number, since it uses less digits than its factorization.

640225870044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93765349 (or 93765347 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 42.

The spelling of 640225870044 in words is "six hundred forty billion, two hundred twenty-five million, eight hundred seventy thousand, forty-four".