778225 has 12 divisors (see below), whose sum is σ = 1103104. Its totient is φ = 533520.

The previous prime is 778223. The next prime is 778237. The reversal of 778225 is 522877.

It is not a de Polignac number, because 778225 - 2¹ = 778223 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

778225 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (778223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2049 + ... + 2398.

2⁷⁷⁸²²⁵ is an apocalyptic number.

It is an amenable number.

778225 is a deficient number, since it is larger than the sum of its proper divisors (324879).

778225 is a wasteful number, since it uses less digits than its factorization.

778225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464 (or 4459 counting only the distinct ones).

The product of its digits is 7840, while the sum is 31.

The square root of 778225 is about 882.1706184180. The cubic root of 778225 is about 91.9817622954.

The spelling of 778225 in words is "seven hundred seventy-eight thousand, two hundred twenty-five".