256785650 has 48 divisors (see below), whose sum is σ = 522609408. Its totient is φ = 93096000.

The previous prime is 256785643. The next prime is 256785667. The reversal of 256785650 is 56587652.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297119 + ... + 297981.

It is an arithmetic number, because the mean of its divisors is an integer number (10887696).

Almost surely, 2^256785650 is an apocalyptic number.

256785650 is an abundant number, since it is smaller than the sum of its proper divisors (265823758).

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

256785650 is a wasteful number, since it uses less digits than its factorization.

256785650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427 (or 1422 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 44.

The square root of 256785650 is about 16024.5327544986. The cubic root of 256785650 is about 635.6093103727.

The spelling of 256785650 in words is "two hundred fifty-six million, seven hundred eighty-five thousand, six hundred fifty".