256280355 has 40 divisors (see below), whose sum is σ = 486443232. Its totient is φ = 128639232.

The previous prime is 256280351. The next prime is 256280357. The reversal of 256280355 is 553082652.

It is a happy number.

256280355 is a `hidden beast` number, since 25 + 6 + 280 + 355 = 666.

256280355 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 256280355 - 2² = 256280351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256280351) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11727 + ... + 25496.

Almost surely, 2^256280355 is an apocalyptic number.

256280355 is a deficient number, since it is larger than the sum of its proper divisors (230162877).

256280355 is a wasteful number, since it uses less digits than its factorization.

256280355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37257 (or 37248 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 256280355 is about 16008.7586964137. The cubic root of 256280355 is about 635.1921257156.

The spelling of 256280355 in words is "two hundred fifty-six million, two hundred eighty thousand, three hundred fifty-five".