28223773 has 2 divisors, whose sum is σ = 28223774. Its totient is φ = 28223772.

The previous prime is 28223761. The next prime is 28223779. The reversal of 28223773 is 37732282.

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., 25220484 + 3003289 = 5022^2 + 1733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28223773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28223779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111886 + 14111887.

It is an arithmetic number, because the mean of its divisors is an integer number (14111887).

Almost surely, 2^28223773 is an apocalyptic number.

It is an amenable number.

28223773 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223773 is an equidigital number, since it uses as much as digits as its factorization.

28223773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 34.

The square root of 28223773 is about 5312.6051048426. The cubic root of 28223773 is about 304.4656881842.

The spelling of 28223773 in words is "twenty-eight million, two hundred twenty-three thousand, seven hundred seventy-three".