628332109 has 12 divisors (see below), whose sum is σ = 670811200. Its totient is φ = 586818648.

The previous prime is 628332059. The next prime is 628332137. The reversal of 628332109 is 901233826.

It is a happy number.

It is not a de Polignac number, because 628332109 - 2²⁹ = 91461197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628332139) 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, 970824 + ... + 971470.

Almost surely, 2^628332109 is an apocalyptic number.

It is an amenable number.

628332109 is a deficient number, since it is larger than the sum of its proper divisors (42479091).

628332109 is an frugal number, since it uses more digits than its factorization.

628332109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 628332109 is about 25066.5535923868. The cubic root of 628332109 is about 856.5047014393.

The spelling of 628332109 in words is "six hundred twenty-eight million, three hundred thirty-two thousand, one hundred nine".