28539664 has 10 divisors (see below), whose sum is σ = 55295630. Its totient is φ = 14269824.

The previous prime is 28539647. The next prime is 28539677. The reversal of 28539664 is 46693582.

It can be written as a sum of positive squares in only one way, i.e., 25080064 + 3459600 = 5008^2 + 1860^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28539664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 891849 + ... + 891880.

It is an arithmetic number, because the mean of its divisors is an integer number (5529563).

Almost surely, 2^28539664 is an apocalyptic number.

It is an amenable number.

28539664 is a deficient number, since it is larger than the sum of its proper divisors (26755966).

28539664 is a wasteful number, since it uses less digits than its factorization.

28539664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783737 (or 1783731 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 28539664 is about 5342.2527083619. The cubic root of 28539664 is about 305.5973744098.

The spelling of 28539664 in words is "twenty-eight million, five hundred thirty-nine thousand, six hundred sixty-four".