4256128724 has 12 divisors (see below), whose sum is σ = 7457866164. Its totient is φ = 2125309824.

The previous prime is 4256128699. The next prime is 4256128739. The reversal of 4256128724 is 4278216524.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1027843600 + 3228285124 = 32060^2 + 56818^2 .

It is a super-2 number, since 2×4256128724² = 36229263430515736352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 685157 + ... + 691340.

It is an arithmetic number, because the mean of its divisors is an integer number (621488847).

Almost surely, 2^4256128724 is an apocalyptic number.

It is an amenable number.

4256128724 is a deficient number, since it is larger than the sum of its proper divisors (3201737440).

4256128724 is a wasteful number, since it uses less digits than its factorization.

4256128724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377274 (or 1377272 counting only the distinct ones).

The product of its digits is 215040, while the sum is 41.

The square root of 4256128724 is about 65239.0122855949. The cubic root of 4256128724 is about 1620.5841418309.

The spelling of 4256128724 in words is "four billion, two hundred fifty-six million, one hundred twenty-eight thousand, seven hundred twenty-four".