256070731 has 4 divisors (see below), whose sum is σ = 292652272. Its totient is φ = 219489192.

The previous prime is 256070713. The next prime is 256070827. The reversal of 256070731 is 137070652.

256070731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256070731 - 2⁵ = 256070699 is a prime.

It is a super-2 number, since 2×256070731² = 131144438549748722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256070693 and 256070702.

It is not an unprimeable number, because it can be changed into a prime (256070831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18290760 + ... + 18290773.

It is an arithmetic number, because the mean of its divisors is an integer number (73163068).

Almost surely, 2^256070731 is an apocalyptic number.

256070731 is a deficient number, since it is larger than the sum of its proper divisors (36581541).

256070731 is an equidigital number, since it uses as much as digits as its factorization.

256070731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36581540.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 256070731 is about 16002.2101910955. The cubic root of 256070731 is about 635.0188937690.

The spelling of 256070731 in words is "two hundred fifty-six million, seventy thousand, seven hundred thirty-one".