28719867 has 16 divisors (see below), whose sum is σ = 42665472. Its totient is φ = 17034720.

The previous prime is 28719833. The next prime is 28719871. The reversal of 28719867 is 76891782.

It is not a de Polignac number, because 28719867 - 2⁸ = 28719611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28719827) 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 in 15 ways as a sum of consecutive naturals, for example, 7708 + ... + 10809.

It is an arithmetic number, because the mean of its divisors is an integer number (2666592).

Almost surely, 2^28719867 is an apocalyptic number.

28719867 is a deficient number, since it is larger than the sum of its proper divisors (13945605).

28719867 is a wasteful number, since it uses less digits than its factorization.

28719867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18578.

The product of its digits is 338688, while the sum is 48.

The square root of 28719867 is about 5359.0919939855. The cubic root of 28719867 is about 306.2392187236.

The spelling of 28719867 in words is "twenty-eight million, seven hundred nineteen thousand, eight hundred sixty-seven".