28973293 has 2 divisors, whose sum is σ = 28973294. Its totient is φ = 28973292.

The previous prime is 28973249. The next prime is 28973311. The reversal of 28973293 is 39237982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19474569 + 9498724 = 4413^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 28973293 - 2⁹ = 28972781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28973093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14486646 + 14486647.

It is an arithmetic number, because the mean of its divisors is an integer number (14486647).

Almost surely, 2^28973293 is an apocalyptic number.

It is an amenable number.

28973293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28973293 is an equidigital number, since it uses as much as digits as its factorization.

28973293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 28973293 is about 5382.6845532689. The cubic root of 28973293 is about 307.1373405381.

The spelling of 28973293 in words is "twenty-eight million, nine hundred seventy-three thousand, two hundred ninety-three".