256449885 has 16 divisors (see below), whose sum is σ = 428160384. Its totient is φ = 130826432.

The previous prime is 256449883. The next prime is 256449901. The reversal of 256449885 is 588944652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256449885 - 2¹ = 256449883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256449883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371322 + ... + 372011.

It is an arithmetic number, because the mean of its divisors is an integer number (26760024).

Almost surely, 2^256449885 is an apocalyptic number.

It is an amenable number.

256449885 is a deficient number, since it is larger than the sum of its proper divisors (171710499).

256449885 is a wasteful number, since it uses less digits than its factorization.

256449885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743364.

The product of its digits is 2764800, while the sum is 51.

The square root of 256449885 is about 16014.0527350200. The cubic root of 256449885 is about 635.3321551576.

The spelling of 256449885 in words is "two hundred fifty-six million, four hundred forty-nine thousand, eight hundred eighty-five".