256793355 has 64 divisors (see below), whose sum is σ = 561899520. Its totient is φ = 108355968.

The previous prime is 256793353. The next prime is 256793359. The reversal of 256793355 is 553397652.

It is a happy number.

256793355 is a `hidden beast` number, since 2 + 567 + 9 + 33 + 55 = 666.

It is not a de Polignac number, because 256793355 - 2¹ = 256793353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 256793355.

It is not an unprimeable number, because it can be changed into a prime (256793353) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1834 + ... + 22736.

It is an arithmetic number, because the mean of its divisors is an integer number (8779680).

Almost surely, 2^256793355 is an apocalyptic number.

256793355 is an abundant number, since it is smaller than the sum of its proper divisors (305106165).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256793355 is a wasteful number, since it uses less digits than its factorization.

256793355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20937 (or 20931 counting only the distinct ones).

The product of its digits is 850500, while the sum is 45.

The square root of 256793355 is about 16024.7731653212. The cubic root of 256793355 is about 635.6156675825.

The spelling of 256793355 in words is "two hundred fifty-six million, seven hundred ninety-three thousand, three hundred fifty-five".