778919972 has 12 divisors (see below), whose sum is σ = 1434852720. Its totient is φ = 368962056.

The previous prime is 778919971. The next prime is 778919983. The reversal of 778919972 is 279919877.

It is not an unprimeable number, because it can be changed into a prime (778919971) by changing a digit.

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, 5124398 + ... + 5124549.

It is an arithmetic number, because the mean of its divisors is an integer number (119571060).

Almost surely, 2^778919972 is an apocalyptic number.

It is an amenable number.

778919972 is a deficient number, since it is larger than the sum of its proper divisors (655932748).

778919972 is a wasteful number, since it uses less digits than its factorization.

778919972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10248970 (or 10248968 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 59.

The square root of 778919972 is about 27909.1377867536. The cubic root of 778919972 is about 920.0913472625.

The spelling of 778919972 in words is "seven hundred seventy-eight million, nine hundred nineteen thousand, nine hundred seventy-two".