256680280 has 32 divisors (see below), whose sum is σ = 611504640. Its totient is φ = 96632320.

The previous prime is 256680271. The next prime is 256680311. The reversal of 256680280 is 82086652.

It is a super-2 number, since 2×256680280² = 131769532281756800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 188056 + ... + 189415.

It is an arithmetic number, because the mean of its divisors is an integer number (19109520).

Almost surely, 2^256680280 is an apocalyptic number.

256680280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256680280 is an abundant number, since it is smaller than the sum of its proper divisors (354824360).

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

256680280 is a wasteful number, since it uses less digits than its factorization.

256680280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377499 (or 377495 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 256680280 is about 16021.2446457820. The cubic root of 256680280 is about 635.5223593614.

The spelling of 256680280 in words is "two hundred fifty-six million, six hundred eighty thousand, two hundred eighty".