256844280 has 432 divisors, whose sum is σ = 1039809960. Its totient is φ = 50561280.

The previous prime is 256844267. The next prime is 256844317. The reversal of 256844280 is 82448652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 13518111 + ... + 13518129.

Almost surely, 2^256844280 is an apocalyptic number.

256844280 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 256844280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519904980).

256844280 is an abundant number, since it is smaller than the sum of its proper divisors (782965680).

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

256844280 is a wasteful number, since it uses less digits than its factorization.

256844280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 39.

The square root of 256844280 is about 16026.3620326012. The cubic root of 256844280 is about 635.6576813753.

Multiplying 256844280 by its product of nonzero digits (122880), we get a square (31561025126400 = 5617920²).

The spelling of 256844280 in words is "two hundred fifty-six million, eight hundred forty-four thousand, two hundred eighty".