28223597 has 2 divisors, whose sum is σ = 28223598. Its totient is φ = 28223596.

The previous prime is 28223593. The next prime is 28223603. The reversal of 28223597 is 79532282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14280841 + 13942756 = 3779^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 28223597 - 2² = 28223593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28223597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28223593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111798 + 14111799.

It is an arithmetic number, because the mean of its divisors is an integer number (14111799).

Almost surely, 2^28223597 is an apocalyptic number.

It is an amenable number.

28223597 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223597 is an equidigital number, since it uses as much as digits as its factorization.

28223597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 28223597 is about 5312.5885404386. The cubic root of 28223597 is about 304.4650553126.

The spelling of 28223597 in words is "twenty-eight million, two hundred twenty-three thousand, five hundred ninety-seven".