664648758 has 24 divisors (see below), whose sum is σ = 1445281968. Its totient is φ = 220748112.

The previous prime is 664648757. The next prime is 664648763. The reversal of 664648758 is 857846466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664648757) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61666 + ... + 71637.

It is an arithmetic number, because the mean of its divisors is an integer number (60220082).

Almost surely, 2^664648758 is an apocalyptic number.

664648758 is an abundant number, since it is smaller than the sum of its proper divisors (780633210).

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

664648758 is a wasteful number, since it uses less digits than its factorization.

664648758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133588 (or 133585 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The square root of 664648758 is about 25780.7827266745. The cubic root of 664648758 is about 872.6981711473.

The spelling of 664648758 in words is "six hundred sixty-four million, six hundred forty-eight thousand, seven hundred fifty-eight".