778401325 has 36 divisors (see below), whose sum is σ = 1081387260. Its totient is φ = 554910720.

The previous prime is 778401317. The next prime is 778401331. The reversal of 778401325 is 523104877.

It can be written as a sum of positive squares in 18 ways, for example, as 732730761 + 45670564 = 27069^2 + 6758^2 .

It is not a de Polignac number, because 778401325 - 2³ = 778401317 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 119349 + ... + 125701.

It is an arithmetic number, because the mean of its divisors is an integer number (30038535).

Almost surely, 2^778401325 is an apocalyptic number.

It is an amenable number.

778401325 is a deficient number, since it is larger than the sum of its proper divisors (302985935).

778401325 is a wasteful number, since it uses less digits than its factorization.

778401325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6418 (or 6400 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 778401325 is about 27899.8445336170. The cubic root of 778401325 is about 919.8870864102.

The spelling of 778401325 in words is "seven hundred seventy-eight million, four hundred one thousand, three hundred twenty-five".