256433740 has 12 divisors (see below), whose sum is σ = 538510896. Its totient is φ = 102573488.

The previous prime is 256433731. The next prime is 256433783. The reversal of 256433740 is 47334652.

It is a junction number, because it is equal to n+sod(n) for n = 256433696 and 256433705.

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, 6410824 + ... + 6410863.

It is an arithmetic number, because the mean of its divisors is an integer number (44875908).

Almost surely, 2^256433740 is an apocalyptic number.

256433740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256433740 is an abundant number, since it is smaller than the sum of its proper divisors (282077156).

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

256433740 is a wasteful number, since it uses less digits than its factorization.

256433740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12821696 (or 12821694 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 34.

The square root of 256433740 is about 16013.5486385748. The cubic root of 256433740 is about 635.3188222695.

The spelling of 256433740 in words is "two hundred fifty-six million, four hundred thirty-three thousand, seven hundred forty".