28788679 has 4 divisors (see below), whose sum is σ = 28805400. Its totient is φ = 28771960.

The previous prime is 28788673. The next prime is 28788689. The reversal of 28788679 is 97688782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97688782 = 2 ⋅48844391.

It is a cyclic number.

It is not a de Polignac number, because 28788679 - 2⁵ = 28788647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788673) 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, 5437 + ... + 9334.

It is an arithmetic number, because the mean of its divisors is an integer number (7201350).

Almost surely, 2^28788679 is an apocalyptic number.

28788679 is a deficient number, since it is larger than the sum of its proper divisors (16721).

28788679 is a wasteful number, since it uses less digits than its factorization.

28788679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16720.

The product of its digits is 2709504, while the sum is 55.

The square root of 28788679 is about 5365.5082704251. The cubic root of 28788679 is about 306.4836038552.

The spelling of 28788679 in words is "twenty-eight million, seven hundred eighty-eight thousand, six hundred seventy-nine".