778225172 has 12 divisors (see below), whose sum is σ = 1362277056. Its totient is φ = 389003160.

The previous prime is 778225169. The next prime is 778225193. The reversal of 778225172 is 271522877.

It is a hoax number, since the sum of its digits (41) 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10154 + ... + 40737.

It is an arithmetic number, because the mean of its divisors is an integer number (113523088).

Almost surely, 2^778225172 is an apocalyptic number.

It is an amenable number.

778225172 is a deficient number, since it is larger than the sum of its proper divisors (584051884).

778225172 is a wasteful number, since it uses less digits than its factorization.

778225172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54718 (or 54716 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 778225172 is about 27896.6874736052. The cubic root of 778225172 is about 919.8176907187.

The spelling of 778225172 in words is "seven hundred seventy-eight million, two hundred twenty-five thousand, one hundred seventy-two".