256489724 has 6 divisors (see below), whose sum is σ = 448857024. Its totient is φ = 128244860.

The previous prime is 256489699. The next prime is 256489769. The reversal of 256489724 is 427984652.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 32061212 + ... + 32061219.

It is an arithmetic number, because the mean of its divisors is an integer number (74809504).

Almost surely, 2^256489724 is an apocalyptic number.

It is an amenable number.

256489724 is a deficient number, since it is larger than the sum of its proper divisors (192367300).

256489724 is a wasteful number, since it uses less digits than its factorization.

256489724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64122435 (or 64122433 counting only the distinct ones).

The product of its digits is 967680, while the sum is 47.

The square root of 256489724 is about 16015.2965629738. The cubic root of 256489724 is about 635.3650526666.

The spelling of 256489724 in words is "two hundred fifty-six million, four hundred eighty-nine thousand, seven hundred twenty-four".