28690904 has 32 divisors (see below), whose sum is σ = 59443200. Its totient is φ = 12873120.

The previous prime is 28690901. The next prime is 28690919. The reversal of 28690904 is 40909682.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28690901) 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, 4889 + ... + 9015.

It is an arithmetic number, because the mean of its divisors is an integer number (1857600).

Almost surely, 2^28690904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28690904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29721600).

28690904 is an abundant number, since it is smaller than the sum of its proper divisors (30752296).

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

28690904 is a wasteful number, since it uses less digits than its factorization.

28690904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223 (or 4219 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 28690904 is about 5356.3890822083. The cubic root of 28690904 is about 306.1362401858.

The spelling of 28690904 in words is "twenty-eight million, six hundred ninety thousand, nine hundred four".