256802580 has 72 divisors (see below), whose sum is σ = 783724032. Its totient is φ = 68062656.

The previous prime is 256802573. The next prime is 256802597. The reversal of 256802580 is 85208652.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25789 + ... + 34331.

It is an arithmetic number, because the mean of its divisors is an integer number (10885056).

Almost surely, 2^256802580 is an apocalyptic number.

256802580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256802580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391862016).

256802580 is an abundant number, since it is smaller than the sum of its proper divisors (526921452).

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

256802580 is a wasteful number, since it uses less digits than its factorization.

256802580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8725 (or 8720 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 256802580 is about 16025.0609983238. The cubic root of 256802580 is about 635.6232787404.

The spelling of 256802580 in words is "two hundred fifty-six million, eight hundred two thousand, five hundred eighty".