778628632679 has 4 divisors (see below), whose sum is σ = 778658586384. Its totient is φ = 778598678976.

The previous prime is 778628632637. The next prime is 778628632687. The reversal of 778628632679 is 976236826877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778628632679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778628632979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14937827 + ... + 14989860.

It is an arithmetic number, because the mean of its divisors is an integer number (194664646596).

Almost surely, 2^778628632679 is an apocalyptic number.

778628632679 is a deficient number, since it is larger than the sum of its proper divisors (29953705).

778628632679 is a wasteful number, since it uses less digits than its factorization.

778628632679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29953704.

The product of its digits is 512096256, while the sum is 71.

The spelling of 778628632679 in words is "seven hundred seventy-eight billion, six hundred twenty-eight million, six hundred thirty-two thousand, six hundred seventy-nine".