628338889 has 8 divisors (see below), whose sum is σ = 630850248. Its totient is φ = 625833600.

The previous prime is 628338869. The next prime is 628338913. The reversal of 628338889 is 988833826.

628338889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 95883264 + 532455625 = 9792^2 + 23075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628338889 - 2¹⁵ = 628306121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628338869) 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, 333819 + ... + 335695.

It is an arithmetic number, because the mean of its divisors is an integer number (78856281).

Almost surely, 2^628338889 is an apocalyptic number.

It is an amenable number.

628338889 is a deficient number, since it is larger than the sum of its proper divisors (2511359).

628338889 is a wasteful number, since it uses less digits than its factorization.

628338889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3035.

The product of its digits is 3981312, while the sum is 55.

The square root of 628338889 is about 25066.6888319937. The cubic root of 628338889 is about 856.5077821248.

The spelling of 628338889 in words is "six hundred twenty-eight million, three hundred thirty-eight thousand, eight hundred eighty-nine".