256542477 has 8 divisors (see below), whose sum is σ = 343010880. Its totient is φ = 170551200.

The previous prime is 256542469. The next prime is 256542487. The reversal of 256542477 is 774245652.

256542477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256542477 - 2³ = 256542469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256542487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118024 + ... + 120177.

It is an arithmetic number, because the mean of its divisors is an integer number (42876360).

Almost surely, 2^256542477 is an apocalyptic number.

It is an amenable number.

256542477 is a deficient number, since it is larger than the sum of its proper divisors (86468403).

256542477 is a wasteful number, since it uses less digits than its factorization.

256542477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238563.

The product of its digits is 470400, while the sum is 42.

The square root of 256542477 is about 16016.9434350003. The cubic root of 256542477 is about 635.4086088170.

The spelling of 256542477 in words is "two hundred fifty-six million, five hundred forty-two thousand, four hundred seventy-seven".