722625666 has 32 divisors (see below), whose sum is σ = 1653765120. Its totient is φ = 206208336.

The previous prime is 722625623. The next prime is 722625721. The reversal of 722625666 is 666526227.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24985 + ... + 45491.

It is an arithmetic number, because the mean of its divisors is an integer number (51680160).

Almost surely, 2^722625666 is an apocalyptic number.

722625666 is an abundant number, since it is smaller than the sum of its proper divisors (931139454).

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

722625666 is a wasteful number, since it uses less digits than its factorization.

722625666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21358.

The product of its digits is 362880, while the sum is 42.

The square root of 722625666 is about 26881.6976026441. The cubic root of 722625666 is about 897.3691342726.

The spelling of 722625666 in words is "seven hundred twenty-two million, six hundred twenty-five thousand, six hundred sixty-six".