778425 has 24 divisors (see below), whose sum is σ = 1312416. Its totient is φ = 407040.

The previous prime is 778417. The next prime is 778439. The reversal of 778425 is 524877.

It is not a de Polignac number, because 778425 - 2³ = 778417 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7222 + ... + 7328.

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

2⁷⁷⁸⁴²⁵ is an apocalyptic number.

778425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

778425 is a deficient number, since it is larger than the sum of its proper divisors (533991).

778425 is a wasteful number, since it uses less digits than its factorization.

778425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 212 counting only the distinct ones).

The product of its digits is 15680, while the sum is 33.

The square root of 778425 is about 882.2839678924. The cubic root of 778425 is about 91.9896412408.

The spelling of 778425 in words is "seven hundred seventy-eight thousand, four hundred twenty-five".