256641652 has 12 divisors (see below), whose sum is σ = 449267616. Its totient is φ = 128279480.

The previous prime is 256641631. The next prime is 256641713. The reversal of 256641652 is 256146652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6777 + ... + 23647.

It is an arithmetic number, because the mean of its divisors is an integer number (37438968).

Almost surely, 2^256641652 is an apocalyptic number.

It is an amenable number.

256641652 is a deficient number, since it is larger than the sum of its proper divisors (192625964).

256641652 is a wasteful number, since it uses less digits than its factorization.

256641652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20678 (or 20676 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 256641652 is about 16020.0390761071. The cubic root of 256641652 is about 635.4904776897.

The spelling of 256641652 in words is "two hundred fifty-six million, six hundred forty-one thousand, six hundred fifty-two".