664252290 has 48 divisors (see below), whose sum is σ = 1859909688. Its totient is φ = 163507968.

The previous prime is 664252229. The next prime is 664252297. The reversal of 664252290 is 92252466.

664252290 is a `hidden beast` number, since 6 + 6 + 42 + 522 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 240839361 + 423412929 = 15519^2 + 20577^2 .

It is a super-2 number, since 2×664252290² = 882462209540488200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664252297) 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 23 ways as a sum of consecutive naturals, for example, 282699 + ... + 285038.

Almost surely, 2^664252290 is an apocalyptic number.

664252290 is an abundant number, since it is smaller than the sum of its proper divisors (1195657398).

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

664252290 is a wasteful number, since it uses less digits than its factorization.

664252290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567763 (or 567760 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 664252290 is about 25773.0923639365. The cubic root of 664252290 is about 872.5246129514.

The spelling of 664252290 in words is "six hundred sixty-four million, two hundred fifty-two thousand, two hundred ninety".