28789493 has 2 divisors, whose sum is σ = 28789494. Its totient is φ = 28789492.

The previous prime is 28789487. The next prime is 28789511. The reversal of 28789493 is 39498782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28281124 + 508369 = 5318^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 28789493 - 2⁶ = 28789429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28789433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14394746 + 14394747.

It is an arithmetic number, because the mean of its divisors is an integer number (14394747).

Almost surely, 2^28789493 is an apocalyptic number.

It is an amenable number.

28789493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28789493 is an equidigital number, since it uses as much as digits as its factorization.

28789493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 28789493 is about 5365.5841247715. The cubic root of 28789493 is about 306.4864924363.

The spelling of 28789493 in words is "twenty-eight million, seven hundred eighty-nine thousand, four hundred ninety-three".