256345072 has 10 divisors (see below), whose sum is σ = 496668608. Its totient is φ = 128172528.

The previous prime is 256345049. The next prime is 256345073. The reversal of 256345072 is 270543652.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256345073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8010768 + ... + 8010799.

Almost surely, 2^256345072 is an apocalyptic number.

It is an amenable number.

256345072 is a deficient number, since it is larger than the sum of its proper divisors (240323536).

256345072 is a wasteful number, since it uses less digits than its factorization.

256345072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16021575 (or 16021569 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 34.

The square root of 256345072 is about 16010.7798685760. The cubic root of 256345072 is about 635.2455883503.

The spelling of 256345072 in words is "two hundred fifty-six million, three hundred forty-five thousand, seventy-two".