256023729 has 12 divisors (see below), whose sum is σ = 398259316. Its totient is φ = 157552992.

The previous prime is 256023697. The next prime is 256023737. The reversal of 256023729 is 927320652.

256023729 is a `hidden beast` number, since 2 + 560 + 23 + 72 + 9 = 666.

256023729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 148279329 + 107744400 = 12177^2 + 10380^2 .

It is not a de Polignac number, because 256023729 - 2⁵ = 256023697 is a prime.

It is a super-2 number, since 2×256023729² = 131096299622130882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256023693 and 256023702.

It is not an unprimeable number, because it can be changed into a prime (256023749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1094002 + ... + 1094235.

Almost surely, 2^256023729 is an apocalyptic number.

It is an amenable number.

256023729 is a deficient number, since it is larger than the sum of its proper divisors (142235587).

256023729 is a wasteful number, since it uses less digits than its factorization.

256023729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188256 (or 2188253 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 256023729 is about 16000.7415140674. The cubic root of 256023729 is about 634.9800386393.

The spelling of 256023729 in words is "two hundred fifty-six million, twenty-three thousand, seven hundred twenty-nine".