28791277 has 2 divisors, whose sum is σ = 28791278. Its totient is φ = 28791276.

The previous prime is 28791271. The next prime is 28791283. The reversal of 28791277 is 77219782.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (28791271) and next prime (28791283).

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 9554281 = 4386^2 + 3091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28791277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28791271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14395638 + 14395639.

It is an arithmetic number, because the mean of its divisors is an integer number (14395639).

Almost surely, 2^28791277 is an apocalyptic number.

It is an amenable number.

28791277 is a deficient number, since it is larger than the sum of its proper divisors (1).

28791277 is an equidigital number, since it uses as much as digits as its factorization.

28791277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 43.

The square root of 28791277 is about 5365.7503669105. The cubic root of 28791277 is about 306.4928229937.

The spelling of 28791277 in words is "twenty-eight million, seven hundred ninety-one thousand, two hundred seventy-seven".