978255 has 12 divisors (see below), whose sum is σ = 1695720. Its totient is φ = 521712.

The previous prime is 978239. The next prime is 978269. The reversal of 978255 is 552879.

It is not a de Polignac number, because 978255 - 2⁴ = 978239 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978255.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10825 + ... + 10914.

It is an arithmetic number, because the mean of its divisors is an integer number (141310).

2⁹⁷⁸²⁵⁵ is an apocalyptic number.

978255 is a deficient number, since it is larger than the sum of its proper divisors (717465).

978255 is a wasteful number, since it uses less digits than its factorization.

978255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21750 (or 21747 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 978255 is about 989.0677428771. The cubic root of 978255 is about 99.2698484288.

The spelling of 978255 in words is "nine hundred seventy-eight thousand, two hundred fifty-five".