256477747 has 4 divisors (see below), whose sum is σ = 263409616. Its totient is φ = 249545880.

The previous prime is 256477717. The next prime is 256477777. The reversal of 256477747 is 747774652.

It is a happy number.

256477747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (256477717) and next prime (256477777).

It is a cyclic number.

It is not a de Polignac number, because 256477747 - 2²³ = 248089139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256477747.

It is not an unprimeable number, because it can be changed into a prime (256477717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3465879 + ... + 3465952.

It is an arithmetic number, because the mean of its divisors is an integer number (65852404).

Almost surely, 2^256477747 is an apocalyptic number.

256477747 is a deficient number, since it is larger than the sum of its proper divisors (6931869).

256477747 is an equidigital number, since it uses as much as digits as its factorization.

256477747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6931868.

The product of its digits is 2304960, while the sum is 49.

The square root of 256477747 is about 16014.9226348428. The cubic root of 256477747 is about 635.3551628803.

The spelling of 256477747 in words is "two hundred fifty-six million, four hundred seventy-seven thousand, seven hundred forty-seven".