256365720 has 96 divisors (see below), whose sum is σ = 897296400. Its totient is φ = 63104256.

The previous prime is 256365719. The next prime is 256365749. The reversal of 256365720 is 27563652.

It is a happy number.

256365720 is a `hidden beast` number, since 2 + 56 + 36 + 572 + 0 = 666.

It is a super-2 number, since 2×256365720² = 131446764782236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22710 + ... + 32069.

Almost surely, 2^256365720 is an apocalyptic number.

256365720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256365720 is an abundant number, since it is smaller than the sum of its proper divisors (640930680).

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

256365720 is a wasteful number, since it uses less digits than its factorization.

256365720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54809 (or 54802 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 256365720 is about 16011.4246711528. The cubic root of 256365720 is about 635.2626437445.

The spelling of 256365720 in words is "two hundred fifty-six million, three hundred sixty-five thousand, seven hundred twenty".