256445425 has 12 divisors (see below), whose sum is σ = 336698316. Its totient is φ = 193088000.

The previous prime is 256445419. The next prime is 256445437. The reversal of 256445425 is 524544652.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 30724849 + 225720576 = 5543^2 + 15024^2 .

It is not a de Polignac number, because 256445425 - 2³ = 256445417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301276 + ... + 302125.

It is an arithmetic number, because the mean of its divisors is an integer number (28058193).

Almost surely, 2^256445425 is an apocalyptic number.

256445425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256445425 is a deficient number, since it is larger than the sum of its proper divisors (80252891).

256445425 is a wasteful number, since it uses less digits than its factorization.

256445425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603428 (or 603423 counting only the distinct ones).

The product of its digits is 192000, while the sum is 37.

The square root of 256445425 is about 16013.9134817196. The cubic root of 256445425 is about 635.3284720497.

The spelling of 256445425 in words is "two hundred fifty-six million, four hundred forty-five thousand, four hundred twenty-five".