628666826 has 4 divisors (see below), whose sum is σ = 943000242. Its totient is φ = 314333412.

The previous prime is 628666823. The next prime is 628666847.

628666826 is nontrivially palindromic in base 10.

628666826 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 531348601 + 97318225 = 23051^2 + 9865^2 .

It is a super-2 number, since 2×628666826² = 790443956225828552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628666823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157166705 + ... + 157166708.

Almost surely, 2^628666826 is an apocalyptic number.

628666826 is a deficient number, since it is larger than the sum of its proper divisors (314333416).

628666826 is a wasteful number, since it uses less digits than its factorization.

628666826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314333415.

The product of its digits is 1990656, while the sum is 50.

The square root of 628666826 is about 25073.2292694818. The cubic root of 628666826 is about 856.6567631640.

The spelling of 628666826 in words is "six hundred twenty-eight million, six hundred sixty-six thousand, eight hundred twenty-six".