28249877 has 2 divisors, whose sum is σ = 28249878. Its totient is φ = 28249876.

The previous prime is 28249843. The next prime is 28249883. The reversal of 28249877 is 77894282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26306641 + 1943236 = 5129^2 + 1394^2 .

It is a cyclic number.

It is not a de Polignac number, because 28249877 - 2⁸ = 28249621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28249807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124938 + 14124939.

It is an arithmetic number, because the mean of its divisors is an integer number (14124939).

Almost surely, 2^28249877 is an apocalyptic number.

It is an amenable number.

28249877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249877 is an equidigital number, since it uses as much as digits as its factorization.

28249877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 28249877 is about 5315.0613354880. The cubic root of 28249877 is about 304.5595254291.

The spelling of 28249877 in words is "twenty-eight million, two hundred forty-nine thousand, eight hundred seventy-seven".