256236771 has 16 divisors (see below), whose sum is σ = 390832128. Its totient is φ = 146280000.

The previous prime is 256236763. The next prime is 256236781. The reversal of 256236771 is 177632652.

It is not a de Polignac number, because 256236771 - 2³ = 256236763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256236781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18871 + ... + 29471.

It is an arithmetic number, because the mean of its divisors is an integer number (24427008).

Almost surely, 2^256236771 is an apocalyptic number.

256236771 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

256236771 is a deficient number, since it is larger than the sum of its proper divisors (134595357).

256236771 is a wasteful number, since it uses less digits than its factorization.

256236771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11762.

The product of its digits is 105840, while the sum is 39.

The square root of 256236771 is about 16007.3973837098. The cubic root of 256236771 is about 635.1561159544.

The spelling of 256236771 in words is "two hundred fifty-six million, two hundred thirty-six thousand, seven hundred seventy-one".