255773778 has 32 divisors (see below), whose sum is σ = 553543872. Its totient is φ = 78321600.

The previous prime is 255773741. The next prime is 255773779. The reversal of 255773778 is 877377552.

It is a self number, because there is not a number n which added to its sum of digits gives 255773778.

It is not an unprimeable number, because it can be changed into a prime (255773779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8688 + ... + 24228.

It is an arithmetic number, because the mean of its divisors is an integer number (17298246).

Almost surely, 2^255773778 is an apocalyptic number.

255773778 is an abundant number, since it is smaller than the sum of its proper divisors (297770094).

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

255773778 is a wasteful number, since it uses less digits than its factorization.

255773778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15770.

The product of its digits is 2881200, while the sum is 51.

The square root of 255773778 is about 15992.9290000300. The cubic root of 255773778 is about 634.7733317921.

The spelling of 255773778 in words is "two hundred fifty-five million, seven hundred seventy-three thousand, seven hundred seventy-eight".