2256739890 has 64 divisors (see below), whose sum is σ = 5597133696. Its totient is φ = 581893632.

The previous prime is 2256739819. The next prime is 2256739909. The reversal of 2256739890 is 989376522.

It is a super-2 number, since 2×2256739890² = 10185749862234424200, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 174694 + ... + 187166.

It is an arithmetic number, because the mean of its divisors is an integer number (87455214).

Almost surely, 2^2256739890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2256739890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2798566848).

2256739890 is an abundant number, since it is smaller than the sum of its proper divisors (3340393806).

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

2256739890 is a wasteful number, since it uses less digits than its factorization.

2256739890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12683.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 2256739890 is about 47505.1564569574. The cubic root of 2256739890 is about 1311.6778008789.

The spelling of 2256739890 in words is "two billion, two hundred fifty-six million, seven hundred thirty-nine thousand, eight hundred ninety".