628331408 has 20 divisors (see below), whose sum is σ = 1217950320. Its totient is φ = 314021664.

The previous prime is 628331401. The next prime is 628331449. The reversal of 628331408 is 804133826.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (628331401) 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, 32891 + ... + 48357.

It is an arithmetic number, because the mean of its divisors is an integer number (60897516).

Almost surely, 2^628331408 is an apocalyptic number.

It is an amenable number.

628331408 is a deficient number, since it is larger than the sum of its proper divisors (589618912).

628331408 is a wasteful number, since it uses less digits than its factorization.

628331408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18014 (or 18008 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 628331408 is about 25066.5396096071. The cubic root of 628331408 is about 856.5043829187.

The spelling of 628331408 in words is "six hundred twenty-eight million, three hundred thirty-one thousand, four hundred eight".