28689107 has 4 divisors (see below), whose sum is σ = 30199080. Its totient is φ = 27179136.

The previous prime is 28689077. The next prime is 28689113. The reversal of 28689107 is 70198682.

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 28689107 - 2²² = 24494803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28689137) 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, 754958 + ... + 754995.

It is an arithmetic number, because the mean of its divisors is an integer number (7549770).

Almost surely, 2^28689107 is an apocalyptic number.

28689107 is a deficient number, since it is larger than the sum of its proper divisors (1509973).

28689107 is a wasteful number, since it uses less digits than its factorization.

28689107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509972.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28689107 is about 5356.2213359793. The cubic root of 28689107 is about 306.1298486327.

The spelling of 28689107 in words is "twenty-eight million, six hundred eighty-nine thousand, one hundred seven".