28063021 has 4 divisors (see below), whose sum is σ = 32072032. Its totient is φ = 24054012.

The previous prime is 28063003. The next prime is 28063037. The reversal of 28063021 is 12036082.

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 28063021 - 2¹⁷ = 27931949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28062983 and 28063001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28063051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004495 + ... + 2004508.

It is an arithmetic number, because the mean of its divisors is an integer number (8018008).

Almost surely, 2^28063021 is an apocalyptic number.

It is an amenable number.

28063021 is a deficient number, since it is larger than the sum of its proper divisors (4009011).

28063021 is an equidigital number, since it uses as much as digits as its factorization.

28063021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009010.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28063021 is about 5297.4541998964. The cubic root of 28063021 is about 303.8865465666.

The spelling of 28063021 in words is "twenty-eight million, sixty-three thousand, twenty-one".