646683128 has 64 divisors (see below), whose sum is σ = 1580160960. Its totient is φ = 240777216.

The previous prime is 646683101. The next prime is 646683161. The reversal of 646683128 is 821386646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13751 + ... + 38502.

It is an arithmetic number, because the mean of its divisors is an integer number (24690015).

Almost surely, 2^646683128 is an apocalyptic number.

646683128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

646683128 is an abundant number, since it is smaller than the sum of its proper divisors (933477832).

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

646683128 is a wasteful number, since it uses less digits than its factorization.

646683128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52296 (or 52292 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The square root of 646683128 is about 25429.9651592368. The cubic root of 646683128 is about 864.7631538837.

The spelling of 646683128 in words is "six hundred forty-six million, six hundred eighty-three thousand, one hundred twenty-eight".