256364838 has 40 divisors (see below), whose sum is σ = 576202968. Its totient is φ = 85193856.

The previous prime is 256364827. The next prime is 256364887. The reversal of 256364838 is 838463652.

It is a happy number.

256364838 is a `hidden beast` number, since 2 + 5 + 636 + 4 + 8 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 256364793 and 256364802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 54945 + ... + 59427.

Almost surely, 2^256364838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256364838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288101484).

256364838 is an abundant number, since it is smaller than the sum of its proper divisors (319838130).

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

256364838 is a wasteful number, since it uses less digits than its factorization.

256364838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850 (or 4841 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 256364838 is about 16011.3971282958. The cubic root of 256364838 is about 635.2619152250.

The spelling of 256364838 in words is "two hundred fifty-six million, three hundred sixty-four thousand, eight hundred thirty-eight".