28019330 has 16 divisors (see below), whose sum is σ = 50498424. Its totient is φ = 11193600.

The previous prime is 28019317. The next prime is 28019347. The reversal of 28019330 is 3391082.

It can be written as a sum of positive squares in 4 ways, for example, as 10387729 + 17631601 = 3223^2 + 4199^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28019330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10844 + ... + 13176.

Almost surely, 2^28019330 is an apocalyptic number.

28019330 is a deficient number, since it is larger than the sum of its proper divisors (22479094).

28019330 is a wasteful number, since it uses less digits than its factorization.

28019330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 28019330 is about 5293.3288203171. The cubic root of 28019330 is about 303.7287588098.

The spelling of 28019330 in words is "twenty-eight million, nineteen thousand, three hundred thirty".