628820832779 has 4 divisors (see below), whose sum is σ = 632113088640. Its totient is φ = 625528576920.

The previous prime is 628820832769. The next prime is 628820832781. The reversal of 628820832779 is 977238028826.

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

It is a cyclic number.

It is not a de Polignac number, because 628820832779 - 2⁴ = 628820832763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628820832769) 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, 1646127644 + ... + 1646128025.

It is an arithmetic number, because the mean of its divisors is an integer number (158028272160).

Almost surely, 2^628820832779 is an apocalyptic number.

628820832779 is a deficient number, since it is larger than the sum of its proper divisors (3292255861).

628820832779 is a wasteful number, since it uses less digits than its factorization.

628820832779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292255860.

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 628820832779 in words is "six hundred twenty-eight billion, eight hundred twenty million, eight hundred thirty-two thousand, seven hundred seventy-nine".