28064521 has 2 divisors, whose sum is σ = 28064522. Its totient is φ = 28064520.

The previous prime is 28064483. The next prime is 28064563. The reversal of 28064521 is 12546082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17338896 + 10725625 = 4164^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 28064521 - 2⁹ = 28064009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28064521.

It is not a weakly prime, because it can be changed into another prime (28064581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14032260 + 14032261.

It is an arithmetic number, because the mean of its divisors is an integer number (14032261).

Almost surely, 2^28064521 is an apocalyptic number.

It is an amenable number.

28064521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28064521 is an equidigital number, since it uses as much as digits as its factorization.

28064521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28064521 is about 5297.5957754438. The cubic root of 28064521 is about 303.8919608292.

The spelling of 28064521 in words is "twenty-eight million, sixty-four thousand, five hundred twenty-one".