28266021 has 12 divisors (see below), whose sum is σ = 46661472. Its totient is φ = 16151976.

The previous prime is 28265983. The next prime is 28266059. The reversal of 28266021 is 12066282.

It is an interprime number because it is at equal distance from previous prime (28265983) and next prime (28266059).

It is not a de Polignac number, because 28266021 - 2⁶ = 28265957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28266061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224271 + ... + 224396.

It is an arithmetic number, because the mean of its divisors is an integer number (3888456).

Almost surely, 2^28266021 is an apocalyptic number.

28266021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28266021 is a deficient number, since it is larger than the sum of its proper divisors (18395451).

28266021 is a wasteful number, since it uses less digits than its factorization.

28266021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448680 (or 448677 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28266021 is about 5316.5798216523. The cubic root of 28266021 is about 304.6175300790.

The spelling of 28266021 in words is "twenty-eight million, two hundred sixty-six thousand, twenty-one".