28339973 has 2 divisors, whose sum is σ = 28339974. Its totient is φ = 28339972.

The previous prime is 28339951. The next prime is 28339999. The reversal of 28339973 is 37993382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 8421604 = 4463^2 + 2902^2 .

It is a cyclic number.

It is not a de Polignac number, because 28339973 - 2¹⁶ = 28274437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28339273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14169986 + 14169987.

It is an arithmetic number, because the mean of its divisors is an integer number (14169987).

Almost surely, 2^28339973 is an apocalyptic number.

It is an amenable number.

28339973 is a deficient number, since it is larger than the sum of its proper divisors (1).

28339973 is an equidigital number, since it uses as much as digits as its factorization.

28339973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 28339973 is about 5323.5301257718. The cubic root of 28339973 is about 304.8829542825.

The spelling of 28339973 in words is "twenty-eight million, three hundred thirty-nine thousand, nine hundred seventy-three".