256312340 has 48 divisors (see below), whose sum is σ = 562759680. Its totient is φ = 97943040.

The previous prime is 256312339. The next prime is 256312367. The reversal of 256312340 is 43213652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46364 + ... + 51596.

It is an arithmetic number, because the mean of its divisors is an integer number (11724160).

Almost surely, 2^256312340 is an apocalyptic number.

256312340 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 256312340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281379840).

256312340 is an abundant number, since it is smaller than the sum of its proper divisors (306447340).

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

256312340 is a wasteful number, since it uses less digits than its factorization.

256312340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352 (or 5350 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 256312340 is about 16009.7576496336. The cubic root of 256312340 is about 635.2185496098.

Adding to 256312340 its reverse (43213652), we get a palindrome (299525992).

It can be divided in two parts, 256312 and 340, that added together give a palindrome (256652).

The spelling of 256312340 in words is "two hundred fifty-six million, three hundred twelve thousand, three hundred forty".