28759021 has 2 divisors, whose sum is σ = 28759022. Its totient is φ = 28759020.

The previous prime is 28758997. The next prime is 28759033. The reversal of 28759021 is 12095782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 509796 = 5315^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 28759021 - 2¹⁵ = 28726253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28759051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14379510 + 14379511.

It is an arithmetic number, because the mean of its divisors is an integer number (14379511).

Almost surely, 2^28759021 is an apocalyptic number.

It is an amenable number.

28759021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28759021 is an equidigital number, since it uses as much as digits as its factorization.

28759021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28759021 is about 5362.7437939920. The cubic root of 28759021 is about 306.3783215682.

The spelling of 28759021 in words is "twenty-eight million, seven hundred fifty-nine thousand, twenty-one".