256888445 has 24 divisors (see below), whose sum is σ = 358783992. Its totient is φ = 175831040.

The previous prime is 256888427. The next prime is 256888453. The reversal of 256888445 is 544888652.

It can be written as a sum of positive squares in 4 ways, for example, as 5285401 + 251603044 = 2299^2 + 15862^2 .

It is not a de Polignac number, because 256888445 - 2¹⁸ = 256626301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256888393 and 256888402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2204 + ... + 22773.

It is an arithmetic number, because the mean of its divisors is an integer number (14949333).

Almost surely, 2^256888445 is an apocalyptic number.

It is an amenable number.

256888445 is a deficient number, since it is larger than the sum of its proper divisors (101895547).

256888445 is a wasteful number, since it uses less digits than its factorization.

256888445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25021 (or 25010 counting only the distinct ones).

The product of its digits is 2457600, while the sum is 50.

The square root of 256888445 is about 16027.7398593813. The cubic root of 256888445 is about 635.6941135831.

The spelling of 256888445 in words is "two hundred fifty-six million, eight hundred eighty-eight thousand, four hundred forty-five".