646769612 has 24 divisors (see below), whose sum is σ = 1138989600. Its totient is φ = 321351296.

The previous prime is 646769609. The next prime is 646769621. The reversal of 646769612 is 216967646.

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, 799064 + ... + 799872.

It is an arithmetic number, because the mean of its divisors is an integer number (47457900).

Almost surely, 2^646769612 is an apocalyptic number.

It is an amenable number.

646769612 is a deficient number, since it is larger than the sum of its proper divisors (492219988).

646769612 is a wasteful number, since it uses less digits than its factorization.

646769612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825 (or 1823 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 646769612 is about 25431.6655372785. The cubic root of 646769612 is about 864.8017017906.

It can be divided in two parts, 64 and 6769612, that added together give a palindrome (6769676).

The spelling of 646769612 in words is "six hundred forty-six million, seven hundred sixty-nine thousand, six hundred twelve".