778425425 has 12 divisors (see below), whose sum is σ = 991336476. Its totient is φ = 605908800.

The previous prime is 778425419. The next prime is 778425451. The reversal of 778425425 is 524524877.

778425425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 8473921 + 769951504 = 2911^2 + 27748^2 .

It is a de Polignac number, because none of the positive numbers 2^k-778425425 is a prime.

It is a super-2 number, since 2×778425425² = 1211892284572861250, which contains 22 as substring.

It is a Duffinian number.

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, 419846 + ... + 421695.

It is an arithmetic number, because the mean of its divisors is an integer number (82611373).

Almost surely, 2^778425425 is an apocalyptic number.

It is an amenable number.

778425425 is a deficient number, since it is larger than the sum of its proper divisors (212911051).

778425425 is a wasteful number, since it uses less digits than its factorization.

778425425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841588 (or 841583 counting only the distinct ones).

The product of its digits is 627200, while the sum is 44.

The square root of 778425425 is about 27900.2764323223. The cubic root of 778425425 is about 919.8965798208.

The spelling of 778425425 in words is "seven hundred seventy-eight million, four hundred twenty-five thousand, four hundred twenty-five".