425581664 has 24 divisors (see below), whose sum is σ = 857351880. Its totient is φ = 207841536.

The previous prime is 425581657. The next prime is 425581669. The reversal of 425581664 is 466185524.

It is a super-2 number, since 2×425581664² = 362239505466017792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425581669) 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, 153269 + ... + 156020.

It is an arithmetic number, because the mean of its divisors is an integer number (35722995).

Almost surely, 2^425581664 is an apocalyptic number.

It is an amenable number.

425581664 is an abundant number, since it is smaller than the sum of its proper divisors (431770216).

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

425581664 is a wasteful number, since it uses less digits than its factorization.

425581664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309342 (or 309334 counting only the distinct ones).

The product of its digits is 230400, while the sum is 41.

The square root of 425581664 is about 20629.6307286388. The cubic root of 425581664 is about 752.1901397878.

The spelling of 425581664 in words is "four hundred twenty-five million, five hundred eighty-one thousand, six hundred sixty-four".