28879897 has 2 divisors, whose sum is σ = 28879898. Its totient is φ = 28879896.

The previous prime is 28879883. The next prime is 28879909. The reversal of 28879897 is 79897882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27081616 + 1798281 = 5204^2 + 1341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28879897 is a prime.

It is not a weakly prime, because it can be changed into another prime (28879847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14439948 + 14439949.

It is an arithmetic number, because the mean of its divisors is an integer number (14439949).

Almost surely, 2^28879897 is an apocalyptic number.

It is an amenable number.

28879897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28879897 is an equidigital number, since it uses as much as digits as its factorization.

28879897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 58.

The square root of 28879897 is about 5374.0019538515. The cubic root of 28879897 is about 306.8069641344.

The spelling of 28879897 in words is "twenty-eight million, eight hundred seventy-nine thousand, eight hundred ninety-seven".