28040420879 has 2 divisors, whose sum is σ = 28040420880. Its totient is φ = 28040420878.

The previous prime is 28040420861. The next prime is 28040420893. The reversal of 28040420879 is 97802404082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28040420879 - 2³² = 23745453583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28040420809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14020210439 + 14020210440.

It is an arithmetic number, because the mean of its divisors is an integer number (14020210440).

Almost surely, 2^28040420879 is an apocalyptic number.

28040420879 is a deficient number, since it is larger than the sum of its proper divisors (1).

28040420879 is an equidigital number, since it uses as much as digits as its factorization.

28040420879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 28040420879 in words is "twenty-eight billion, forty million, four hundred twenty thousand, eight hundred seventy-nine".