640500448 has 24 divisors (see below), whose sum is σ = 1441126512. Its totient is φ = 274500096.

The previous prime is 640500439. The next prime is 640500461. The reversal of 640500448 is 844005046.

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, 1429465 + ... + 1429912.

It is an arithmetic number, because the mean of its divisors is an integer number (60046938).

Almost surely, 2^640500448 is an apocalyptic number.

It is an amenable number.

640500448 is an abundant number, since it is smaller than the sum of its proper divisors (800626064).

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

640500448 is a wasteful number, since it uses less digits than its factorization.

640500448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859394 (or 2859386 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 640500448 is about 25308.1103206067. The cubic root of 640500448 is about 861.9984388514.

The spelling of 640500448 in words is "six hundred forty million, five hundred thousand, four hundred forty-eight".