256723860 has 24 divisors (see below), whose sum is σ = 718826976. Its totient is φ = 68459680.

The previous prime is 256723847. The next prime is 256723867. The reversal of 256723860 is 68327652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256723867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2139306 + ... + 2139425.

It is an arithmetic number, because the mean of its divisors is an integer number (29951124).

Almost surely, 2^256723860 is an apocalyptic number.

256723860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256723860 is an abundant number, since it is smaller than the sum of its proper divisors (462103116).

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

256723860 is a wasteful number, since it uses less digits than its factorization.

256723860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278743 (or 4278741 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 256723860 is about 16022.6046571711. The cubic root of 256723860 is about 635.5583243332.

The spelling of 256723860 in words is "two hundred fifty-six million, seven hundred twenty-three thousand, eight hundred sixty".