640575448 has 16 divisors (see below), whose sum is σ = 1206108000. Its totient is φ = 318946656.

The previous prime is 640575401. The next prime is 640575473. The reversal of 640575448 is 844575046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165603 + ... + 169426.

It is an arithmetic number, because the mean of its divisors is an integer number (75381750).

Almost surely, 2^640575448 is an apocalyptic number.

It is an amenable number.

640575448 is a deficient number, since it is larger than the sum of its proper divisors (565532552).

640575448 is a wasteful number, since it uses less digits than its factorization.

640575448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335274 (or 335270 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 43.

The square root of 640575448 is about 25309.5920156766. The cubic root of 640575448 is about 862.0320830431.

The spelling of 640575448 in words is "six hundred forty million, five hundred seventy-five thousand, four hundred forty-eight".