664757754 has 16 divisors (see below), whose sum is σ = 1357803648. Its totient is φ = 216871232.

The previous prime is 664757729. The next prime is 664757761. The reversal of 664757754 is 457757466.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 664757697 and 664757706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1178367 + ... + 1178930.

It is an arithmetic number, because the mean of its divisors is an integer number (84862728).

Almost surely, 2^664757754 is an apocalyptic number.

664757754 is an abundant number, since it is smaller than the sum of its proper divisors (693045894).

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

664757754 is a wasteful number, since it uses less digits than its factorization.

664757754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357349.

The product of its digits is 4939200, while the sum is 51.

The square root of 664757754 is about 25782.8965401485. The cubic root of 664757754 is about 872.7458732403.

The spelling of 664757754 in words is "six hundred sixty-four million, seven hundred fifty-seven thousand, seven hundred fifty-four".