2256720988 has 12 divisors (see below), whose sum is σ = 3957374512. Its totient is φ = 1126042560.

The previous prime is 2256720979. The next prime is 2256721009. The reversal of 2256720988 is 8890276522.

It is a happy number.

It is a super-2 number, since 2×2256720988² = 10185579235359392288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 577293 + ... + 581188.

Almost surely, 2^2256720988 is an apocalyptic number.

It is an amenable number.

2256720988 is a deficient number, since it is larger than the sum of its proper divisors (1700653524).

2256720988 is a wasteful number, since it uses less digits than its factorization.

2256720988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158972 (or 1158970 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 2256720988 is about 47504.9575097168. The cubic root of 2256720988 is about 1311.6741387521.

The spelling of 2256720988 in words is "two billion, two hundred fifty-six million, seven hundred twenty thousand, nine hundred eighty-eight".