256326420 has 48 divisors (see below), whose sum is σ = 820245888. Its totient is φ = 58588800.

The previous prime is 256326419. The next prime is 256326437. The reversal of 256326420 is 24623652.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304731 + ... + 305570.

It is an arithmetic number, because the mean of its divisors is an integer number (17088456).

Almost surely, 2^256326420 is an apocalyptic number.

256326420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256326420 is an abundant number, since it is smaller than the sum of its proper divisors (563919468).

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

256326420 is a wasteful number, since it uses less digits than its factorization.

256326420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610320 (or 610318 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 256326420 is about 16010.1973754230. The cubic root of 256326420 is about 635.2301808789.

The spelling of 256326420 in words is "two hundred fifty-six million, three hundred twenty-six thousand, four hundred twenty".