2256866440 has 16 divisors (see below), whose sum is σ = 5077949580. Its totient is φ = 902746560.

The previous prime is 2256866347. The next prime is 2256866441. The reversal of 2256866440 is 446686522.

It can be written as a sum of positive squares in 2 ways, for example, as 1936528036 + 320338404 = 44006^2 + 17898^2 .

It is a super-3 number, since 3×2256866440³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2256866441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28210791 + ... + 28210870.

Almost surely, 2^2256866440 is an apocalyptic number.

2256866440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2256866440 is an abundant number, since it is smaller than the sum of its proper divisors (2821083140).

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

2256866440 is a wasteful number, since it uses less digits than its factorization.

2256866440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56421672 (or 56421668 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The square root of 2256866440 is about 47506.4883989545. The cubic root of 2256866440 is about 1311.7023185063.

The spelling of 2256866440 in words is "two billion, two hundred fifty-six million, eight hundred sixty-six thousand, four hundred forty".