256746438 has 48 divisors (see below), whose sum is σ = 608929776. Its totient is φ = 77699520.

The previous prime is 256746419. The next prime is 256746481. The reversal of 256746438 is 834647652.

256746438 is a `hidden beast` number, since 2 + 567 + 46 + 43 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 256746393 and 256746402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5281 + ... + 23267.

It is an arithmetic number, because the mean of its divisors is an integer number (12686037).

Almost surely, 2^256746438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256746438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304464888).

256746438 is an abundant number, since it is smaller than the sum of its proper divisors (352183338).

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

256746438 is a wasteful number, since it uses less digits than its factorization.

256746438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18069 (or 18066 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 256746438 is about 16023.3092087746. The cubic root of 256746438 is about 635.5769555260.

The spelling of 256746438 in words is "two hundred fifty-six million, seven hundred forty-six thousand, four hundred thirty-eight".