628450728 has 32 divisors (see below), whose sum is σ = 1571812800. Its totient is φ = 209392128.

The previous prime is 628450717. The next prime is 628450729. The reversal of 628450728 is 827054826.

It is a happy number.

628450728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 628450728.

It is not an unprimeable number, because it can be changed into a prime (628450729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71925 + ... + 80187.

It is an arithmetic number, because the mean of its divisors is an integer number (49119150).

Almost surely, 2^628450728 is an apocalyptic number.

It is an amenable number.

628450728 is an abundant number, since it is smaller than the sum of its proper divisors (943362072).

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

628450728 is a wasteful number, since it uses less digits than its factorization.

628450728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11441 (or 11437 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 628450728 is about 25068.9195618798. The cubic root of 628450728 is about 856.5585961536.

The spelling of 628450728 in words is "six hundred twenty-eight million, four hundred fifty thousand, seven hundred twenty-eight".