664438048 has 12 divisors (see below), whose sum is σ = 1308112470. Its totient is φ = 332219008.

The previous prime is 664438039. The next prime is 664438091. The reversal of 664438048 is 840834466.

It can be written as a sum of positive squares in only one way, i.e., 664195984 + 242064 = 25772^2 + 492^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 664437995 and 664438013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10381813 + ... + 10381876.

Almost surely, 2^664438048 is an apocalyptic number.

It is an amenable number.

664438048 is a deficient number, since it is larger than the sum of its proper divisors (643674422).

664438048 is a wasteful number, since it uses less digits than its factorization.

664438048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20763699 (or 20763691 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The square root of 664438048 is about 25776.6958317004. The cubic root of 664438048 is about 872.6059391400.

The spelling of 664438048 in words is "six hundred sixty-four million, four hundred thirty-eight thousand, forty-eight".