256734465 has 32 divisors (see below), whose sum is σ = 443149056. Its totient is φ = 126170880.

The previous prime is 256734463. The next prime is 256734469. The reversal of 256734465 is 564437652.

256734465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256734465 - 2¹ = 256734463 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256734463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200407 + ... + 201683.

It is an arithmetic number, because the mean of its divisors is an integer number (13848408).

Almost surely, 2^256734465 is an apocalyptic number.

It is an amenable number.

256734465 is a deficient number, since it is larger than the sum of its proper divisors (186414591).

256734465 is a wasteful number, since it uses less digits than its factorization.

256734465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329.

The product of its digits is 604800, while the sum is 42.

The square root of 256734465 is about 16022.9355924562. The cubic root of 256734465 is about 635.5670756341.

The spelling of 256734465 in words is "two hundred fifty-six million, seven hundred thirty-four thousand, four hundred sixty-five".