628926809 has 12 divisors (see below), whose sum is σ = 770115600. Its totient is φ = 510706728.

The previous prime is 628926803. The next prime is 628926829. The reversal of 628926809 is 908629826.

It is a de Polignac number, because none of the positive numbers 2^k-628926809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628926803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 336839 + ... + 338700.

It is an arithmetic number, because the mean of its divisors is an integer number (64176300).

Almost surely, 2^628926809 is an apocalyptic number.

It is an amenable number.

628926809 is a deficient number, since it is larger than the sum of its proper divisors (141188791).

628926809 is a wasteful number, since it uses less digits than its factorization.

628926809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675572 (or 675565 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 628926809 is about 25078.4132073782. The cubic root of 628926809 is about 856.7748360403.

The spelling of 628926809 in words is "six hundred twenty-eight million, nine hundred twenty-six thousand, eight hundred nine".