256745233 has 4 divisors (see below), whose sum is σ = 270258160. Its totient is φ = 243232308.

The previous prime is 256745231. The next prime is 256745243. The reversal of 256745233 is 332547652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256745233 - 2¹ = 256745231 is a prime.

It is a super-2 number, since 2×256745233² = 131836229336448578, 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 = 256745192 and 256745201.

It is not an unprimeable number, because it can be changed into a prime (256745231) 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, 6756435 + ... + 6756472.

It is an arithmetic number, because the mean of its divisors is an integer number (67564540).

Almost surely, 2^256745233 is an apocalyptic number.

It is an amenable number.

256745233 is a deficient number, since it is larger than the sum of its proper divisors (13512927).

256745233 is a wasteful number, since it uses less digits than its factorization.

256745233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13512926.

The product of its digits is 151200, while the sum is 37.

The square root of 256745233 is about 16023.2716072592. The cubic root of 256745233 is about 635.5759611969.

The spelling of 256745233 in words is "two hundred fifty-six million, seven hundred forty-five thousand, two hundred thirty-three".