664735460 has 24 divisors (see below), whose sum is σ = 1429993656. Its totient is φ = 259408640.

The previous prime is 664735457. The next prime is 664735469. The reversal of 664735460 is 64537466.

It can be written as a sum of positive squares in 4 ways, for example, as 10705984 + 654029476 = 3272^2 + 25574^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (664735469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404507 + ... + 406146.

It is an arithmetic number, because the mean of its divisors is an integer number (59583069).

Almost surely, 2^664735460 is an apocalyptic number.

It is an amenable number.

664735460 is an abundant number, since it is smaller than the sum of its proper divisors (765258196).

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

664735460 is a wasteful number, since it uses less digits than its factorization.

664735460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810703 (or 810701 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 664735460 is about 25782.4641956505. The cubic root of 664735460 is about 872.7361166967.

The spelling of 664735460 in words is "six hundred sixty-four million, seven hundred thirty-five thousand, four hundred sixty".