28505699 has 2 divisors, whose sum is σ = 28505700. Its totient is φ = 28505698.

The previous prime is 28505683. The next prime is 28505723. The reversal of 28505699 is 99650582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28505699 - 2⁴ = 28505683 is a prime.

It is not a weakly prime, because it can be changed into another prime (28505639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252849 + 14252850.

It is an arithmetic number, because the mean of its divisors is an integer number (14252850).

Almost surely, 2^28505699 is an apocalyptic number.

28505699 is a deficient number, since it is larger than the sum of its proper divisors (1).

28505699 is an equidigital number, since it uses as much as digits as its factorization.

28505699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 28505699 is about 5339.0728595890. The cubic root of 28505699 is about 305.4760960008.

It can be divided in two parts, 2850 and 5699, that multiplied together give a triangular number (16242150 = T₅₆₉₉).

The spelling of 28505699 in words is "twenty-eight million, five hundred five thousand, six hundred ninety-nine".