628832779 has 4 divisors (see below), whose sum is σ = 630179784. Its totient is φ = 627485776.

The previous prime is 628832777. The next prime is 628832801. The reversal of 628832779 is 977238826.

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 628832779 - 2¹ = 628832777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628832773) 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, 672802 + ... + 673735.

It is an arithmetic number, because the mean of its divisors is an integer number (157544946).

Almost surely, 2^628832779 is an apocalyptic number.

628832779 is a deficient number, since it is larger than the sum of its proper divisors (1347005).

628832779 is a wasteful number, since it uses less digits than its factorization.

628832779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347004.

The product of its digits is 2032128, while the sum is 52.

The square root of 628832779 is about 25076.5384174132. The cubic root of 628832779 is about 856.7321354949.

The spelling of 628832779 in words is "six hundred twenty-eight million, eight hundred thirty-two thousand, seven hundred seventy-nine".