2256520440 has 64 divisors (see below), whose sum is σ = 6818313600. Its totient is φ = 597405312.

The previous prime is 2256520423. The next prime is 2256520459. The reversal of 2256520440 is 440256522.

It is a happy number.

It is a super-2 number, since 2×2256520440² = 10183768992275587200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2256520398 and 2256520407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50962 + ... + 84321.

It is an arithmetic number, because the mean of its divisors is an integer number (106536150).

Almost surely, 2^2256520440 is an apocalyptic number.

2256520440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2256520440 is an abundant number, since it is smaller than the sum of its proper divisors (4561793160).

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

2256520440 is a wasteful number, since it uses less digits than its factorization.

2256520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135436 (or 135432 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 2256520440 is about 47502.8466515429. The cubic root of 2256520440 is about 1311.6352827572.

Adding to 2256520440 its reverse (440256522), we get a palindrome (2696776962).

The spelling of 2256520440 in words is "two billion, two hundred fifty-six million, five hundred twenty thousand, four hundred forty".