28801536 has 80 divisors (see below), whose sum is σ = 81316224. Its totient is φ = 9027584.

The previous prime is 28801523. The next prime is 28801541. The reversal of 28801536 is 63510882.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28801497 and 28801506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25561 + ... + 26663.

Almost surely, 2^28801536 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 28801536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40658112).

28801536 is an abundant number, since it is smaller than the sum of its proper divisors (52514688).

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

28801536 is a wasteful number, since it uses less digits than its factorization.

28801536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28801536 is about 5366.7062524420. The cubic root of 28801536 is about 306.5292221721.

The spelling of 28801536 in words is "twenty-eight million, eight hundred one thousand, five hundred thirty-six".