28511668 has 12 divisors (see below), whose sum is σ = 50837220. Its totient is φ = 13986752.

The previous prime is 28511641. The next prime is 28511677. The reversal of 28511668 is 86611582.

It can be written as a sum of positive squares in 2 ways, for example, as 21178404 + 7333264 = 4602^2 + 2708^2 .

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 67033 + ... + 67456.

It is an arithmetic number, because the mean of its divisors is an integer number (4236435).

Almost surely, 2^28511668 is an apocalyptic number.

It is an amenable number.

28511668 is a deficient number, since it is larger than the sum of its proper divisors (22325552).

28511668 is a wasteful number, since it uses less digits than its factorization.

28511668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134546 (or 134544 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 28511668 is about 5339.6318225136. The cubic root of 28511668 is about 305.4974164107.

The spelling of 28511668 in words is "twenty-eight million, five hundred eleven thousand, six hundred sixty-eight".