28717107 has 4 divisors (see below), whose sum is σ = 38289480. Its totient is φ = 19144736.

The previous prime is 28717103. The next prime is 28717109. The reversal of 28717107 is 70171782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28717107 - 2² = 28717103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28717103) 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, 4786182 + ... + 4786187.

It is an arithmetic number, because the mean of its divisors is an integer number (9572370).

Almost surely, 2^28717107 is an apocalyptic number.

28717107 is a deficient number, since it is larger than the sum of its proper divisors (9572373).

28717107 is an equidigital number, since it uses as much as digits as its factorization.

28717107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9572372.

The product of its (nonzero) digits is 5488, while the sum is 33.

The square root of 28717107 is about 5358.8344814894. The cubic root of 28717107 is about 306.2294084725.

Adding to 28717107 its reverse (70171782), we get a palindrome (98888889).

The spelling of 28717107 in words is "twenty-eight million, seven hundred seventeen thousand, one hundred seven".