664734757 has 4 divisors (see below), whose sum is σ = 664887520. Its totient is φ = 664581996.

The previous prime is 664734727. The next prime is 664734773. The reversal of 664734757 is 757437466.

664734757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664734757 - 2¹¹ = 664732709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664734757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664734727) 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, 69657 + ... + 78622.

It is an arithmetic number, because the mean of its divisors is an integer number (166221880).

Almost surely, 2^664734757 is an apocalyptic number.

It is an amenable number.

664734757 is a deficient number, since it is larger than the sum of its proper divisors (152763).

664734757 is a wasteful number, since it uses less digits than its factorization.

664734757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152762.

The product of its digits is 2963520, while the sum is 49.

The square root of 664734757 is about 25782.4505623496. The cubic root of 664734757 is about 872.7358090387.

The spelling of 664734757 in words is "six hundred sixty-four million, seven hundred thirty-four thousand, seven hundred fifty-seven".