28023866 has 8 divisors (see below), whose sum is σ = 45269364. Its totient is φ = 12934080.

The previous prime is 28023857. The next prime is 28023923. The reversal of 28023866 is 66832082.

It can be written as a sum of positive squares in 2 ways, for example, as 27867841 + 156025 = 5279^2 + 395^2 .

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

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, 538895 + ... + 538946.

Almost surely, 2^28023866 is an apocalyptic number.

28023866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28023866 is a deficient number, since it is larger than the sum of its proper divisors (17245498).

28023866 is a wasteful number, since it uses less digits than its factorization.

28023866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077856.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 28023866 is about 5293.7572668191. The cubic root of 28023866 is about 303.7451479634.

The spelling of 28023866 in words is "twenty-eight million, twenty-three thousand, eight hundred sixty-six".