778291966 has 32 divisors (see below), whose sum is σ = 1259079840. Its totient is φ = 360049536.

The previous prime is 778291939. The next prime is 778291967. The reversal of 778291966 is 669192877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778291967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141076 + ... + 146488.

It is an arithmetic number, because the mean of its divisors is an integer number (39346245).

Almost surely, 2^778291966 is an apocalyptic number.

778291966 is a deficient number, since it is larger than the sum of its proper divisors (480787874).

778291966 is a wasteful number, since it uses less digits than its factorization.

778291966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5548.

The product of its digits is 2286144, while the sum is 55.

The square root of 778291966 is about 27897.8846151460. The cubic root of 778291966 is about 919.8440055298.

The spelling of 778291966 in words is "seven hundred seventy-eight million, two hundred ninety-one thousand, nine hundred sixty-six".