256771530 has 24 divisors (see below), whose sum is σ = 667606212. Its totient is φ = 68472384.

The previous prime is 256771523. The next prime is 256771531. The reversal of 256771530 is 35177652.

256771530 is a `hidden beast` number, since 2 + 56 + 7 + 71 + 530 = 666.

256771530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 241771401 + 15000129 = 15549^2 + 3873^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (256771531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1426419 + ... + 1426598.

Almost surely, 2^256771530 is an apocalyptic number.

256771530 is an abundant number, since it is smaller than the sum of its proper divisors (410834682).

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

256771530 is a wasteful number, since it uses less digits than its factorization.

256771530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853030 (or 2853027 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 256771530 is about 16024.0921739735. The cubic root of 256771530 is about 635.5976599710.

The spelling of 256771530 in words is "two hundred fifty-six million, seven hundred seventy-one thousand, five hundred thirty".