28014821 has 4 divisors (see below), whose sum is σ = 28140672. Its totient is φ = 27888972.

The previous prime is 28014817. The next prime is 28014829. The reversal of 28014821 is 12841082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28014821 - 2² = 28014817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28014829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62591 + ... + 63036.

It is an arithmetic number, because the mean of its divisors is an integer number (7035168).

Almost surely, 2^28014821 is an apocalyptic number.

It is an amenable number.

28014821 is a deficient number, since it is larger than the sum of its proper divisors (125851).

28014821 is a wasteful number, since it uses less digits than its factorization.

28014821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125850.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28014821 is about 5292.9028897194. The cubic root of 28014821 is about 303.7124654575.

The spelling of 28014821 in words is "twenty-eight million, fourteen thousand, eight hundred twenty-one".