28101866 has 8 divisors (see below), whose sum is σ = 45395364. Its totient is φ = 12970080.

The previous prime is 28101823. The next prime is 28101889. The reversal of 28101866 is 66810182.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 7590025 = 4529^2 + 2755^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540395 + ... + 540446.

Almost surely, 2^28101866 is an apocalyptic number.

28101866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28101866 is a deficient number, since it is larger than the sum of its proper divisors (17293498).

28101866 is a wasteful number, since it uses less digits than its factorization.

28101866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080856.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28101866 is about 5301.1193157672. The cubic root of 28101866 is about 304.0266957743.

The spelling of 28101866 in words is "twenty-eight million, one hundred one thousand, eight hundred sixty-six".