28122877 has 2 divisors, whose sum is σ = 28122878. Its totient is φ = 28122876.

The previous prime is 28122863. The next prime is 28122883. The reversal of 28122877 is 77822182.

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., 27311076 + 811801 = 5226^2 + 901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28122877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28122827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14061438 + 14061439.

It is an arithmetic number, because the mean of its divisors is an integer number (14061439).

Almost surely, 2^28122877 is an apocalyptic number.

It is an amenable number.

28122877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28122877 is an equidigital number, since it uses as much as digits as its factorization.

28122877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 28122877 is about 5303.1006967622. The cubic root of 28122877 is about 304.1024477255.

The spelling of 28122877 in words is "twenty-eight million, one hundred twenty-two thousand, eight hundred seventy-seven".