646349756 has 12 divisors (see below), whose sum is σ = 1218120792. Its totient is φ = 298315248.

The previous prime is 646349747. The next prime is 646349761. The reversal of 646349756 is 657943646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6214850 + ... + 6214953.

It is an arithmetic number, because the mean of its divisors is an integer number (101510066).

Almost surely, 2^646349756 is an apocalyptic number.

It is an amenable number.

646349756 is a deficient number, since it is larger than the sum of its proper divisors (571771036).

646349756 is a wasteful number, since it uses less digits than its factorization.

646349756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12429820 (or 12429818 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 50.

The square root of 646349756 is about 25423.4096061091. The cubic root of 646349756 is about 864.6145301543.

The spelling of 646349756 in words is "six hundred forty-six million, three hundred forty-nine thousand, seven hundred fifty-six".