28266621 has 8 divisors (see below), whose sum is σ = 37752384. Its totient is φ = 18812640.

The previous prime is 28266593. The next prime is 28266629. The reversal of 28266621 is 12666282.

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

It is not a de Polignac number, because 28266621 - 2⁷ = 28266493 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28266629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5785 + ... + 9486.

It is an arithmetic number, because the mean of its divisors is an integer number (4719048).

Almost surely, 2^28266621 is an apocalyptic number.

It is an amenable number.

28266621 is a deficient number, since it is larger than the sum of its proper divisors (9485763).

28266621 is a wasteful number, since it uses less digits than its factorization.

28266621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15891.

The product of its digits is 13824, while the sum is 33.

The square root of 28266621 is about 5316.6362486068. The cubic root of 28266621 is about 304.6196854256.

The spelling of 28266621 in words is "twenty-eight million, two hundred sixty-six thousand, six hundred twenty-one".