256154278 has 4 divisors (see below), whose sum is σ = 384231420. Its totient is φ = 128077138.

The previous prime is 256154263. The next prime is 256154309. The reversal of 256154278 is 872451652.

256154278 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 a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 256154278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64038568 + ... + 64038571.

It is an arithmetic number, because the mean of its divisors is an integer number (96057855).

Almost surely, 2^256154278 is an apocalyptic number.

256154278 is a deficient number, since it is larger than the sum of its proper divisors (128077142).

256154278 is a wasteful number, since it uses less digits than its factorization.

256154278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128077141.

The product of its digits is 134400, while the sum is 40.

The square root of 256154278 is about 16004.8204613485. The cubic root of 256154278 is about 635.0879478079.

The spelling of 256154278 in words is "two hundred fifty-six million, one hundred fifty-four thousand, two hundred seventy-eight".