28405679 has 2 divisors, whose sum is σ = 28405680. Its totient is φ = 28405678.

The previous prime is 28405673. The next prime is 28405697. The reversal of 28405679 is 97650482.

Together with next prime (28405697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28405679 - 2⁸ = 28405423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28405673) 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, 14202839 + 14202840.

It is an arithmetic number, because the mean of its divisors is an integer number (14202840).

Almost surely, 2^28405679 is an apocalyptic number.

28405679 is a deficient number, since it is larger than the sum of its proper divisors (1).

28405679 is an equidigital number, since it uses as much as digits as its factorization.

28405679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 28405679 is about 5329.6978338364. The cubic root of 28405679 is about 305.1183953144.

It can be divided in two parts, 2840 and 5679, that multiplied together give a triangular number (16128360 = T₅₆₇₉).

The spelling of 28405679 in words is "twenty-eight million, four hundred five thousand, six hundred seventy-nine".