778538564 has 24 divisors (see below), whose sum is σ = 1395639168. Its totient is φ = 379804320.

The previous prime is 778538543. The next prime is 778538573. The reversal of 778538564 is 465835877.

778538564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×778538564² = 1212244591270364192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209894 + ... + 213570.

It is an arithmetic number, because the mean of its divisors is an integer number (58151632).

Almost surely, 2^778538564 is an apocalyptic number.

It is an amenable number.

778538564 is a deficient number, since it is larger than the sum of its proper divisors (617100604).

778538564 is a wasteful number, since it uses less digits than its factorization.

778538564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955 (or 4953 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 53.

The square root of 778538564 is about 27902.3039192107. The cubic root of 778538564 is about 919.9411446281.

The spelling of 778538564 in words is "seven hundred seventy-eight million, five hundred thirty-eight thousand, five hundred sixty-four".