28120877 has 2 divisors, whose sum is σ = 28120878. Its totient is φ = 28120876.

The previous prime is 28120871. The next prime is 28120879. The reversal of 28120877 is 77802182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25210441 + 2910436 = 5021^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 28120877 - 2²⁰ = 27072301 is a prime.

Together with 28120879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28120871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060438 + 14060439.

It is an arithmetic number, because the mean of its divisors is an integer number (14060439).

Almost surely, 2^28120877 is an apocalyptic number.

It is an amenable number.

28120877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28120877 is an equidigital number, since it uses as much as digits as its factorization.

28120877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28120877 is about 5302.9121244841. The cubic root of 28120877 is about 304.0952386561.

The spelling of 28120877 in words is "twenty-eight million, one hundred twenty thousand, eight hundred seventy-seven".