664505284 has 9 divisors (see below), whose sum is σ = 1162974477. Its totient is φ = 332226864.

The previous prime is 664505249. The next prime is 664505291. The reversal of 664505284 is 482505466.

The square root of 664505284 is 25778.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 435890884 + 228614400 = 20878^2 + 15120^2 .

It is a super-4 number, since 4×664505284⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45112 + ... + 58000.

Almost surely, 2^664505284 is an apocalyptic number.

664505284 is the 25778-th square number.

It is an amenable number.

664505284 is a deficient number, since it is larger than the sum of its proper divisors (498469193).

664505284 is an frugal number, since it uses more digits than its factorization.

664505284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25782 (or 12891 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The cubic root of 664505284 is about 872.6353718083.

Multiplying 664505284 by its product of nonzero digits (230400), we get a square (153102017433600 = 12373440²).

The spelling of 664505284 in words is "six hundred sixty-four million, five hundred five thousand, two hundred eighty-four".