28127779 has 2 divisors, whose sum is σ = 28127780. Its totient is φ = 28127778.

The previous prime is 28127753. The next prime is 28127783. The reversal of 28127779 is 97772182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28127779 - 2⁵ = 28127747 is a prime.

It is not a weakly prime, because it can be changed into another prime (28197779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14063889 + 14063890.

It is an arithmetic number, because the mean of its divisors is an integer number (14063890).

Almost surely, 2^28127779 is an apocalyptic number.

28127779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28127779 is an equidigital number, since it uses as much as digits as its factorization.

28127779 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 28127779 is about 5303.5628590599. The cubic root of 28127779 is about 304.1201157091.

The spelling of 28127779 in words is "twenty-eight million, one hundred twenty-seven thousand, seven hundred seventy-nine".