28335421 has 2 divisors, whose sum is σ = 28335422. Its totient is φ = 28335420.

The previous prime is 28335389. The next prime is 28335427. The reversal of 28335421 is 12453382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 509796 = 5275^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 28335421 - 2⁵ = 28335389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28335421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28335427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14167710 + 14167711.

It is an arithmetic number, because the mean of its divisors is an integer number (14167711).

Almost surely, 2^28335421 is an apocalyptic number.

It is an amenable number.

28335421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28335421 is an equidigital number, since it uses as much as digits as its factorization.

28335421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 28335421 is about 5323.1025727483. The cubic root of 28335421 is about 304.8666298548.

The spelling of 28335421 in words is "twenty-eight million, three hundred thirty-five thousand, four hundred twenty-one".