28772197 has 2 divisors, whose sum is σ = 28772198. Its totient is φ = 28772196.

The previous prime is 28772189. The next prime is 28772257. The reversal of 28772197 is 79127782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 7667361 = 4594^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 28772197 - 2³ = 28772189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28772167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14386098 + 14386099.

It is an arithmetic number, because the mean of its divisors is an integer number (14386099).

Almost surely, 2^28772197 is an apocalyptic number.

It is an amenable number.

28772197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28772197 is an equidigital number, since it uses as much as digits as its factorization.

28772197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 43.

The square root of 28772197 is about 5363.9721289358. The cubic root of 28772197 is about 306.4251036941.

The spelling of 28772197 in words is "twenty-eight million, seven hundred seventy-two thousand, one hundred ninety-seven".