256658478 has 8 divisors (see below), whose sum is σ = 513316968. Its totient is φ = 85552824.

The previous prime is 256658477. The next prime is 256658509. The reversal of 256658478 is 874856652.

It is a happy number.

256658478 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.

256658478 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 256658478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256658471) 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, 21388201 + ... + 21388212.

It is an arithmetic number, because the mean of its divisors is an integer number (64164621).

Almost surely, 2^256658478 is an apocalyptic number.

256658478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256658478 is a wasteful number, since it uses less digits than its factorization.

256658478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42776418.

The product of its digits is 3225600, while the sum is 51.

The square root of 256658478 is about 16020.5642222738. The cubic root of 256658478 is about 635.5043654446.

It can be divided in two parts, 25665 and 8478, that added together give a palindrome (34143).

The spelling of 256658478 in words is "two hundred fifty-six million, six hundred fifty-eight thousand, four hundred seventy-eight".