628686826 has 8 divisors (see below), whose sum is σ = 998502660. Its totient is φ = 295852608.

The previous prime is 628686803. The next prime is 628686827.

628686826 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 627552601 + 1134225 = 25051^2 + 1065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (628686827) 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, 9245361 + ... + 9245428.

Almost surely, 2^628686826 is an apocalyptic number.

628686826 is a deficient number, since it is larger than the sum of its proper divisors (369815834).

628686826 is a wasteful number, since it uses less digits than its factorization.

628686826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18490808.

The product of its digits is 2654208, while the sum is 52.

The square root of 628686826 is about 25073.6280980635. The cubic root of 628686826 is about 856.6658474424.

The spelling of 628686826 in words is "six hundred twenty-eight million, six hundred eighty-six thousand, eight hundred twenty-six".