664253460 has 120 divisors (see below), whose sum is σ = 2244150216. Its totient is φ = 163503360.

The previous prime is 664253453. The next prime is 664253483. The reversal of 664253460 is 64352466.

664253460 is a `hidden beast` number, since 6 + 64 + 2 + 534 + 60 = 666.

664253460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 34644996 + 629608464 = 5886^2 + 25092^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5290 + ... + 36830.

Almost surely, 2^664253460 is an apocalyptic number.

664253460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664253460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122075108).

664253460 is an abundant number, since it is smaller than the sum of its proper divisors (1579896756).

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

664253460 is a wasteful number, since it uses less digits than its factorization.

664253460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31575 (or 31564 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 664253460 is about 25773.1150620176. The cubic root of 664253460 is about 872.5251252333.

The spelling of 664253460 in words is "six hundred sixty-four million, two hundred fifty-three thousand, four hundred sixty".