28717319 has 4 divisors (see below), whose sum is σ = 28836720. Its totient is φ = 28597920.

The previous prime is 28717313. The next prime is 28717321. The reversal of 28717319 is 91371782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91371782 = 2 ⋅45685891.

It is a cyclic number.

It is not a de Polignac number, because 28717319 - 2²⁰ = 27668743 is a prime.

It is a super-2 number, since 2×28717319² = 1649368821095522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59339 + ... + 59820.

It is an arithmetic number, because the mean of its divisors is an integer number (7209180).

Almost surely, 2^28717319 is an apocalyptic number.

28717319 is a deficient number, since it is larger than the sum of its proper divisors (119401).

28717319 is a wasteful number, since it uses less digits than its factorization.

28717319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119400.

The product of its digits is 21168, while the sum is 38.

The square root of 28717319 is about 5358.8542618735. The cubic root of 28717319 is about 306.2301620358.

The spelling of 28717319 in words is "twenty-eight million, seven hundred seventeen thousand, three hundred nineteen".