628966659 has 4 divisors (see below), whose sum is σ = 838622216. Its totient is φ = 419311104.

The previous prime is 628966631. The next prime is 628966661. The reversal of 628966659 is 956669826.

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

It is not a de Polignac number, because 628966659 - 2¹⁷ = 628835587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628966599 and 628966608.

It is not an unprimeable number, because it can be changed into a prime (628966619) 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, 104827774 + ... + 104827779.

It is an arithmetic number, because the mean of its divisors is an integer number (209655554).

Almost surely, 2^628966659 is an apocalyptic number.

628966659 is a deficient number, since it is larger than the sum of its proper divisors (209655557).

628966659 is a wasteful number, since it uses less digits than its factorization.

628966659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209655556.

The product of its digits is 8398080, while the sum is 57.

The square root of 628966659 is about 25079.2077027964. The cubic root of 628966659 is about 856.7929312863.

The spelling of 628966659 in words is "six hundred twenty-eight million, nine hundred sixty-six thousand, six hundred fifty-nine".