28406879 has 2 divisors, whose sum is σ = 28406880. Its totient is φ = 28406878.

The previous prime is 28406839. The next prime is 28406923. The reversal of 28406879 is 97860482.

It is an a-pointer prime, because the next prime (28406923) can be obtained adding 28406879 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28406879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28406839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203439 + 14203440.

It is an arithmetic number, because the mean of its divisors is an integer number (14203440).

Almost surely, 2^28406879 is an apocalyptic number.

28406879 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406879 is an equidigital number, since it uses as much as digits as its factorization.

28406879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28406879 is about 5329.8104093861. The cubic root of 28406879 is about 305.1226918369.

The spelling of 28406879 in words is "twenty-eight million, four hundred six thousand, eight hundred seventy-nine".