28879609 has 8 divisors (see below), whose sum is σ = 31667328. Its totient is φ = 26118960.

The previous prime is 28879589. The next prime is 28879649. The reversal of 28879609 is 90697882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28879609 - 2¹¹ = 28877561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28879649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4497 + ... + 8830.

It is an arithmetic number, because the mean of its divisors is an integer number (3958416).

Almost surely, 2^28879609 is an apocalyptic number.

It is an amenable number.

28879609 is a deficient number, since it is larger than the sum of its proper divisors (2787719).

28879609 is a wasteful number, since it uses less digits than its factorization.

28879609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13535.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 28879609 is about 5373.9751581115. The cubic root of 28879609 is about 306.8059442704.

It can be divided in two parts, 288 and 79609, that added together give a palindrome (79897).

The spelling of 28879609 in words is "twenty-eight million, eight hundred seventy-nine thousand, six hundred nine".