778371992 has 32 divisors (see below), whose sum is σ = 1489298400. Its totient is φ = 381249024.

The previous prime is 778371991. The next prime is 778372033. The reversal of 778371992 is 299173877.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778371991) 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 7 ways as a sum of consecutive naturals, for example, 413309 + ... + 415187.

It is an arithmetic number, because the mean of its divisors is an integer number (46540575).

Almost surely, 2^778371992 is an apocalyptic number.

It is an amenable number.

778371992 is a deficient number, since it is larger than the sum of its proper divisors (710926408).

778371992 is a wasteful number, since it uses less digits than its factorization.

778371992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915 (or 2911 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 53.

The square root of 778371992 is about 27899.3188447317. The cubic root of 778371992 is about 919.8755313653.

The spelling of 778371992 in words is "seven hundred seventy-eight million, three hundred seventy-one thousand, nine hundred ninety-two".