256486818 has 64 divisors (see below), whose sum is σ = 597558528. Its totient is φ = 71884800.

The previous prime is 256486799. The next prime is 256486819. The reversal of 256486818 is 818684652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (256486819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 639418 + ... + 639818.

It is an arithmetic number, because the mean of its divisors is an integer number (9336852).

Almost surely, 2^256486818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256486818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298779264).

256486818 is an abundant number, since it is smaller than the sum of its proper divisors (341071710).

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

256486818 is a wasteful number, since it uses less digits than its factorization.

256486818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667.

The product of its digits is 737280, while the sum is 48.

The square root of 256486818 is about 16015.2058369538. The cubic root of 256486818 is about 635.3626531191.

The spelling of 256486818 in words is "two hundred fifty-six million, four hundred eighty-six thousand, eight hundred eighteen".