28679904 has 108 divisors (see below), whose sum is σ = 89755848. Its totient is φ = 8680320.

The previous prime is 28679899. The next prime is 28679909. The reversal of 28679904 is 40997682.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28679899) and next prime (28679909).

It is a self number, because there is not a number n which added to its sum of digits gives 28679904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28679909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34437 + ... + 35259.

It is a vampire number, since it can be written as 2904 ⋅ 9876 (with its own digits).

Almost surely, 2^28679904 is an apocalyptic number.

28679904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28679904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44877924).

28679904 is an abundant number, since it is smaller than the sum of its proper divisors (61075944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28679904 is a wasteful number, since it uses less digits than its factorization.

28679904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 28679904 is about 5355.3621726266. The cubic root of 28679904 is about 306.0971113026.

The spelling of 28679904 in words is "twenty-eight million, six hundred seventy-nine thousand, nine hundred four".