256347783 has 6 divisors (see below), whose sum is σ = 370280144. Its totient is φ = 170898516.

The previous prime is 256347781. The next prime is 256347799. The reversal of 256347783 is 387743652.

256347783 is a `hidden beast` number, since 2 + 5 + 634 + 7 + 7 + 8 + 3 = 666.

It is not a de Polignac number, because 256347783 - 2¹ = 256347781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256347781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14241535 + ... + 14241552.

Almost surely, 2^256347783 is an apocalyptic number.

256347783 is a deficient number, since it is larger than the sum of its proper divisors (113932361).

256347783 is a wasteful number, since it uses less digits than its factorization.

256347783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28483093 (or 28483090 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 256347783 is about 16010.8645300621. The cubic root of 256347783 is about 635.2478277078.

The spelling of 256347783 in words is "two hundred fifty-six million, three hundred forty-seven thousand, seven hundred eighty-three".