256486625 has 8 divisors (see below), whose sum is σ = 320095464. Its totient is φ = 205189200.

The previous prime is 256486621. The next prime is 256486651. The reversal of 256486625 is 526684652.

It can be written as a sum of positive squares in 4 ways, for example, as 20802721 + 235683904 = 4561^2 + 15352^2 .

It is not a de Polignac number, because 256486625 - 2² = 256486621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256486621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025822 + ... + 1026071.

It is an arithmetic number, because the mean of its divisors is an integer number (40011933).

Almost surely, 2^256486625 is an apocalyptic number.

256486625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256486625 is a deficient number, since it is larger than the sum of its proper divisors (63608839).

256486625 is an equidigital number, since it uses as much as digits as its factorization.

256486625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051908 (or 2051898 counting only the distinct ones).

The product of its digits is 691200, while the sum is 44.

The square root of 256486625 is about 16015.1998114291. The cubic root of 256486625 is about 635.3624937542.

The spelling of 256486625 in words is "two hundred fifty-six million, four hundred eighty-six thousand, six hundred twenty-five".