28781453 has 2 divisors, whose sum is σ = 28781454. Its totient is φ = 28781452.

The previous prime is 28781429. The next prime is 28781471. The reversal of 28781453 is 35418782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22915369 + 5866084 = 4787^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 28781453 - 2²⁰ = 27732877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28781653) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390726 + 14390727.

It is an arithmetic number, because the mean of its divisors is an integer number (14390727).

Almost surely, 2^28781453 is an apocalyptic number.

It is an amenable number.

28781453 is a deficient number, since it is larger than the sum of its proper divisors (1).

28781453 is an equidigital number, since it uses as much as digits as its factorization.

28781453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 38.

The square root of 28781453 is about 5364.8348530034. The cubic root of 28781453 is about 306.4579591005.

The spelling of 28781453 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred fifty-three".