783668816 has 20 divisors (see below), whose sum is σ = 1735266912. Its totient is φ = 335858016.

The previous prime is 783668807. The next prime is 783668833. The reversal of 783668816 is 618866387.

It is a super-2 number, since 2×783668816² = 1228273626341683712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 3498410 + ... + 3498633.

Almost surely, 2^783668816 is an apocalyptic number.

It is an amenable number.

783668816 is an abundant number, since it is smaller than the sum of its proper divisors (951598096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

783668816 is a wasteful number, since it uses less digits than its factorization.

783668816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997058 (or 6997052 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The square root of 783668816 is about 27994.0853753074. The cubic root of 783668816 is about 921.9574014571.

The spelling of 783668816 in words is "seven hundred eighty-three million, six hundred sixty-eight thousand, eight hundred sixteen".