256474465 has 8 divisors (see below), whose sum is σ = 331444008. Its totient is φ = 189396480.

The previous prime is 256474457. The next prime is 256474481. The reversal of 256474465 is 564474652.

It can be written as a sum of positive squares in 4 ways, for example, as 8317456 + 248157009 = 2884^2 + 15753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256474465 - 2³ = 256474457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1972816 + ... + 1972945.

It is an arithmetic number, because the mean of its divisors is an integer number (41430501).

Almost surely, 2^256474465 is an apocalyptic number.

It is an amenable number.

256474465 is a deficient number, since it is larger than the sum of its proper divisors (74969543).

256474465 is a wasteful number, since it uses less digits than its factorization.

256474465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3945779.

The product of its digits is 806400, while the sum is 43.

The square root of 256474465 is about 16014.8201675823. The cubic root of 256474465 is about 635.3524527757.

It can be divided in two parts, 256 and 474465, that added together give a square (474721 = 689²).

The spelling of 256474465 in words is "two hundred fifty-six million, four hundred seventy-four thousand, four hundred sixty-five".