778255 has 8 divisors (see below), whose sum is σ = 964224. Its totient is φ = 602400.

The previous prime is 778247. The next prime is 778301. The reversal of 778255 is 552877.

778255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 778255 - 2³ = 778247 is a prime.

778255 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 778255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2356 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (120528).

2⁷⁷⁸²⁵⁵ is an apocalyptic number.

778255 is a deficient number, since it is larger than the sum of its proper divisors (185969).

778255 is a wasteful number, since it uses less digits than its factorization.

778255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057.

The product of its digits is 19600, while the sum is 34.

The square root of 778255 is about 882.1876217676. The cubic root of 778255 is about 91.9829442232.

The spelling of 778255 in words is "seven hundred seventy-eight thousand, two hundred fifty-five".