28028816 has 10 divisors (see below), whose sum is σ = 54305862. Its totient is φ = 14014400.

The previous prime is 28028807. The next prime is 28028839. The reversal of 28028816 is 61882082.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 3625216 = 4940^2 + 1904^2 .

It is a super-2 number, since 2×28028816² = 1571229052723712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 875885 + ... + 875916.

Almost surely, 2^28028816 is an apocalyptic number.

It is an amenable number.

28028816 is a deficient number, since it is larger than the sum of its proper divisors (26277046).

28028816 is a wasteful number, since it uses less digits than its factorization.

28028816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751809 (or 1751803 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 28028816 is about 5294.2247780010. The cubic root of 28028816 is about 303.7630309346.

The spelling of 28028816 in words is "twenty-eight million, twenty-eight thousand, eight hundred sixteen".