256840550 has 12 divisors (see below), whose sum is σ = 477723516. Its totient is φ = 102736200.

The previous prime is 256840543. The next prime is 256840579. The reversal of 256840550 is 55048652.

It is a self number, because there is not a number n which added to its sum of digits gives 256840550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2568356 + ... + 2568455.

It is an arithmetic number, because the mean of its divisors is an integer number (39810293).

Almost surely, 2^256840550 is an apocalyptic number.

256840550 is a deficient number, since it is larger than the sum of its proper divisors (220882966).

256840550 is a wasteful number, since it uses less digits than its factorization.

256840550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136823 (or 5136818 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 256840550 is about 16026.2456614143. The cubic root of 256840550 is about 635.6546042649.

The spelling of 256840550 in words is "two hundred fifty-six million, eight hundred forty thousand, five hundred fifty".