28079197 has 2 divisors, whose sum is σ = 28079198. Its totient is φ = 28079196.

The previous prime is 28079179. The next prime is 28079201. The reversal of 28079197 is 79197082.

It is a happy number.

Together with previous prime (28079179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26925721 + 1153476 = 5189^2 + 1074^2 .

It is a cyclic number.

It is not a de Polignac number, because 28079197 - 2¹⁵ = 28046429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28079147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039598 + 14039599.

It is an arithmetic number, because the mean of its divisors is an integer number (14039599).

Almost surely, 2^28079197 is an apocalyptic number.

It is an amenable number.

28079197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28079197 is an equidigital number, since it uses as much as digits as its factorization.

28079197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 28079197 is about 5298.9807510501. The cubic root of 28079197 is about 303.9449238001.

The spelling of 28079197 in words is "twenty-eight million, seventy-nine thousand, one hundred ninety-seven".