28719845 has 16 divisors (see below), whose sum is σ = 42968448. Its totient is φ = 17903040.

The previous prime is 28719833. The next prime is 28719871. The reversal of 28719845 is 54891782.

It is not a de Polignac number, because 28719845 - 2⁶ = 28719781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28719796 and 28719805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36914 + ... + 37683.

It is an arithmetic number, because the mean of its divisors is an integer number (2685528).

Almost surely, 2^28719845 is an apocalyptic number.

It is an amenable number.

28719845 is a deficient number, since it is larger than the sum of its proper divisors (14248603).

28719845 is a wasteful number, since it uses less digits than its factorization.

28719845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74620.

The product of its digits is 161280, while the sum is 44.

The square root of 28719845 is about 5359.0899413986. The cubic root of 28719845 is about 306.2391405284.

The spelling of 28719845 in words is "twenty-eight million, seven hundred nineteen thousand, eight hundred forty-five".