2257656520 has 64 divisors (see below), whose sum is σ = 5940443520. Its totient is φ = 756048384.

The previous prime is 2257656497. The next prime is 2257656553. The reversal of 2257656520 is 256567522.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 81717 + ... + 105796.

It is an arithmetic number, because the mean of its divisors is an integer number (92819430).

Almost surely, 2^2257656520 is an apocalyptic number.

2257656520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2257656520 is an abundant number, since it is smaller than the sum of its proper divisors (3682787000).

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

2257656520 is a wasteful number, since it uses less digits than its factorization.

2257656520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187574 (or 187570 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 2257656520 is about 47514.8031670131. The cubic root of 2257656520 is about 1311.8553668271.

The spelling of 2257656520 in words is "two billion, two hundred fifty-seven million, six hundred fifty-six thousand, five hundred twenty".