28719117 has 20 divisors (see below), whose sum is σ = 49031136. Its totient is φ = 16410600.

The previous prime is 28719109. The next prime is 28719151. The reversal of 28719117 is 71191782.

It is not a de Polignac number, because 28719117 - 2³ = 28719109 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28714117) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24759 + ... + 25892.

Almost surely, 2^28719117 is an apocalyptic number.

28719117 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28719117 is a deficient number, since it is larger than the sum of its proper divisors (20312019).

28719117 is an equidigital number, since it uses as much as digits as its factorization.

28719117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50670 (or 50661 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 28719117 is about 5359.0220189882. The cubic root of 28719117 is about 306.2365529567.

The spelling of 28719117 in words is "twenty-eight million, seven hundred nineteen thousand, one hundred seventeen".