28090897 has 2 divisors, whose sum is σ = 28090898. Its totient is φ = 28090896.

The previous prime is 28090877. The next prime is 28090963. The reversal of 28090897 is 79809082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27499536 + 591361 = 5244^2 + 769^2 .

It is a cyclic number.

It is not a de Polignac number, because 28090897 - 2²³ = 19702289 is a prime.

It is not a weakly prime, because it can be changed into another prime (28090837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045448 + 14045449.

It is an arithmetic number, because the mean of its divisors is an integer number (14045449).

Almost surely, 2^28090897 is an apocalyptic number.

It is an amenable number.

28090897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28090897 is an equidigital number, since it uses as much as digits as its factorization.

28090897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 28090897 is about 5300.0846219660. The cubic root of 28090897 is about 303.9871337179.

The spelling of 28090897 in words is "twenty-eight million, ninety thousand, eight hundred ninety-seven".