646646712 has 32 divisors (see below), whose sum is σ = 1626307200. Its totient is φ = 214256864.

The previous prime is 646646683. The next prime is 646646723. The reversal of 646646712 is 217646646.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 76662 + ... + 84677.

It is an arithmetic number, because the mean of its divisors is an integer number (50822100).

Almost surely, 2^646646712 is an apocalyptic number.

It is an amenable number.

646646712 is an abundant number, since it is smaller than the sum of its proper divisors (979660488).

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

646646712 is a wasteful number, since it uses less digits than its factorization.

646646712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161515 (or 161511 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The square root of 646646712 is about 25429.2491434568. The cubic root of 646646712 is about 864.7469214072.

The spelling of 646646712 in words is "six hundred forty-six million, six hundred forty-six thousand, seven hundred twelve".