640048448 has 28 divisors (see below), whose sum is σ = 1367797620. Its totient is φ = 295406592.

The previous prime is 640048447. The next prime is 640048463. The reversal of 640048448 is 844840046.

It can be written as a sum of positive squares in 2 ways, for example, as 81577024 + 558471424 = 9032^2 + 23632^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640048447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383813 + ... + 385476.

It is an arithmetic number, because the mean of its divisors is an integer number (48849915).

Almost surely, 2^640048448 is an apocalyptic number.

It is an amenable number.

640048448 is an abundant number, since it is smaller than the sum of its proper divisors (727749172).

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

640048448 is a wasteful number, since it uses less digits than its factorization.

640048448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769314 (or 769304 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 38.

The square root of 640048448 is about 25299.1788009018. The cubic root of 640048448 is about 861.7956208915.

The spelling of 640048448 in words is "six hundred forty million, forty-eight thousand, four hundred forty-eight".