256236428 has 12 divisors (see below), whose sum is σ = 512472912. Its totient is φ = 109815600.

The previous prime is 256236377. The next prime is 256236457. The reversal of 256236428 is 824632652.

256236428 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 256236391 and 256236400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4575623 + ... + 4575678.

It is an arithmetic number, because the mean of its divisors is an integer number (42706076).

Almost surely, 2^256236428 is an apocalyptic number.

256236428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256236428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256236428 is a wasteful number, since it uses less digits than its factorization.

256236428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9151312 (or 9151310 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 256236428 is about 16007.3866699096. The cubic root of 256236428 is about 635.1558325464.

The spelling of 256236428 in words is "two hundred fifty-six million, two hundred thirty-six thousand, four hundred twenty-eight".