628399900 has 36 divisors (see below), whose sum is σ = 1443845088. Its totient is φ = 236573440.

The previous prime is 628399867. The next prime is 628399921. The reversal of 628399900 is 9993826.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183124 + ... + 186523.

It is an arithmetic number, because the mean of its divisors is an integer number (40106808).

Almost surely, 2^628399900 is an apocalyptic number.

It is an amenable number.

628399900 is an abundant number, since it is smaller than the sum of its proper divisors (815445188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628399900 is a wasteful number, since it uses less digits than its factorization.

628399900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369678 (or 369671 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 628399900 is about 25067.9057761114. The cubic root of 628399900 is about 856.5355032087.

The spelling of 628399900 in words is "six hundred twenty-eight million, three hundred ninety-nine thousand, nine hundred".