28311797 has 2 divisors, whose sum is σ = 28311798. Its totient is φ = 28311796.

The previous prime is 28311791. The next prime is 28311821. The reversal of 28311797 is 79711382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27604516 + 707281 = 5254^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 28311797 - 2⁸ = 28311541 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28311797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28311791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155898 + 14155899.

It is an arithmetic number, because the mean of its divisors is an integer number (14155899).

Almost surely, 2^28311797 is an apocalyptic number.

It is an amenable number.

28311797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311797 is an equidigital number, since it uses as much as digits as its factorization.

28311797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 28311797 is about 5320.8831033955. The cubic root of 28311797 is about 304.7818811376.

The spelling of 28311797 in words is "twenty-eight million, three hundred eleven thousand, seven hundred ninety-seven".