256229645 has 16 divisors (see below), whose sum is σ = 363519360. Its totient is φ = 169641024.

The previous prime is 256229629. The next prime is 256229657. The reversal of 256229645 is 546922652.

It is not a de Polignac number, because 256229645 - 2⁴ = 256229629 is a prime.

It is a super-3 number, since 3×256229645³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125207 + ... + 127236.

It is an arithmetic number, because the mean of its divisors is an integer number (22719960).

Almost surely, 2^256229645 is an apocalyptic number.

It is an amenable number.

256229645 is a deficient number, since it is larger than the sum of its proper divisors (107289715).

256229645 is a wasteful number, since it uses less digits than its factorization.

256229645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252484.

The product of its digits is 259200, while the sum is 41.

The square root of 256229645 is about 16007.1747975712. The cubic root of 256229645 is about 635.1502279569.

The spelling of 256229645 in words is "two hundred fifty-six million, two hundred twenty-nine thousand, six hundred forty-five".