256420154 has 8 divisors (see below), whose sum is σ = 385545108. Its totient is φ = 127905120.

The previous prime is 256420139. The next prime is 256420159. The reversal of 256420154 is 451024652.

256420154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 255264529 + 1155625 = 15977^2 + 1075^2 .

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

It is not an unprimeable number, because it can be changed into a prime (256420159) 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, 151427 + ... + 153110.

Almost surely, 2^256420154 is an apocalyptic number.

256420154 is a deficient number, since it is larger than the sum of its proper divisors (129124954).

256420154 is a wasteful number, since it uses less digits than its factorization.

256420154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304960.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 256420154 is about 16013.1244296671. The cubic root of 256420154 is about 635.3076022249.

The spelling of 256420154 in words is "two hundred fifty-six million, four hundred twenty thousand, one hundred fifty-four".