646622772 has 24 divisors (see below), whose sum is σ = 1534360800. Its totient is φ = 211887456.

The previous prime is 646622749. The next prime is 646622789. The reversal of 646622772 is 277226646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455947 + ... + 457362.

It is an arithmetic number, because the mean of its divisors is an integer number (63931700).

Almost surely, 2^646622772 is an apocalyptic number.

It is an amenable number.

646622772 is an abundant number, since it is smaller than the sum of its proper divisors (887738028).

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

646622772 is a wasteful number, since it uses less digits than its factorization.

646622772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913375 (or 913373 counting only the distinct ones).

The product of its digits is 338688, while the sum is 42.

The square root of 646622772 is about 25428.7784213084. The cubic root of 646622772 is about 864.7362497909.

The spelling of 646622772 in words is "six hundred forty-six million, six hundred twenty-two thousand, seven hundred seventy-two".