646934256 has 40 divisors (see below), whose sum is σ = 1856942160. Its totient is φ = 215644608.

The previous prime is 646934251. The next prime is 646934261. The reversal of 646934256 is 652439646.

It is an interprime number because it is at equal distance from previous prime (646934251) and next prime (646934261).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646934251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748335 + ... + 749198.

It is an arithmetic number, because the mean of its divisors is an integer number (46423554).

Almost surely, 2^646934256 is an apocalyptic number.

It is an amenable number.

646934256 is an abundant number, since it is smaller than the sum of its proper divisors (1210007904).

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

646934256 is a wasteful number, since it uses less digits than its factorization.

646934256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497550 (or 1497538 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 646934256 is about 25434.9023194507. The cubic root of 646934256 is about 864.8750779091.

The spelling of 646934256 in words is "six hundred forty-six million, nine hundred thirty-four thousand, two hundred fifty-six".