28688459 has 4 divisors (see below), whose sum is σ = 28718400. Its totient is φ = 28658520.

The previous prime is 28688447. The next prime is 28688467. The reversal of 28688459 is 95488682.

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 28688459 - 2¹² = 28684363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28688419) 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, 13484 + ... + 15465.

It is an arithmetic number, because the mean of its divisors is an integer number (7179600).

Almost surely, 2^28688459 is an apocalyptic number.

28688459 is a deficient number, since it is larger than the sum of its proper divisors (29941).

28688459 is an equidigital number, since it uses as much as digits as its factorization.

28688459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29940.

The product of its digits is 1105920, while the sum is 50.

The square root of 28688459 is about 5356.1608452323. The cubic root of 28688459 is about 306.1275437668.

The spelling of 28688459 in words is "twenty-eight million, six hundred eighty-eight thousand, four hundred fifty-nine".