771440816 has 20 divisors (see below), whose sum is σ = 1497205512. Its totient is φ = 385065216.

The previous prime is 771440779. The next prime is 771440827. The reversal of 771440816 is 618044177.

771440816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 771440816.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31166 + ... + 50141.

Almost surely, 2^771440816 is an apocalyptic number.

It is an amenable number.

771440816 is a deficient number, since it is larger than the sum of its proper divisors (725764696).

771440816 is a wasteful number, since it uses less digits than its factorization.

771440816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81908 (or 81902 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 771440816 is about 27774.8234197807. The cubic root of 771440816 is about 917.1369785945.

The spelling of 771440816 in words is "seven hundred seventy-one million, four hundred forty thousand, eight hundred sixteen".