778125 has 24 divisors (see below), whose sum is σ = 1312416. Its totient is φ = 410000.

The previous prime is 778123. The next prime is 778153. The reversal of 778125 is 521877.

It is a happy number.

It is not a de Polignac number, because 778125 - 2¹ = 778123 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 778092 and 778101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9334 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (54684).

2⁷⁷⁸¹²⁵ is an apocalyptic number.

778125 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

778125 is a deficient number, since it is larger than the sum of its proper divisors (534291).

778125 is an frugal number, since it uses more digits than its factorization.

778125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 91 counting only the distinct ones).

The product of its digits is 3920, while the sum is 30.

The square root of 778125 is about 882.1139382189. The cubic root of 778125 is about 91.9778223165.

It can be divided in two parts, 778 and 125, that added together give a triangular number (903 = T₄₂).

The spelling of 778125 in words is "seven hundred seventy-eight thousand, one hundred twenty-five".