28917719 has 2 divisors, whose sum is σ = 28917720. Its totient is φ = 28917718.

The previous prime is 28917703. The next prime is 28917743. The reversal of 28917719 is 91771982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28917719 - 2⁴ = 28917703 is a prime.

It is a super-2 number, since 2×28917719² = 1672468944325922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28917719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28917419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14458859 + 14458860.

It is an arithmetic number, because the mean of its divisors is an integer number (14458860).

Almost surely, 2^28917719 is an apocalyptic number.

28917719 is a deficient number, since it is larger than the sum of its proper divisors (1).

28917719 is an equidigital number, since it uses as much as digits as its factorization.

28917719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 28917719 is about 5377.5197814606. The cubic root of 28917719 is about 306.9408403160.

The spelling of 28917719 in words is "twenty-eight million, nine hundred seventeen thousand, seven hundred nineteen".