28133616 has 160 divisors (see below), whose sum is σ = 89264128. Its totient is φ = 7464960.

The previous prime is 28133603. The next prime is 28133621. The reversal of 28133616 is 61633182.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385356 + ... + 385428.

Almost surely, 2^28133616 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 28133616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44632064).

28133616 is an abundant number, since it is smaller than the sum of its proper divisors (61130512).

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

28133616 is a wasteful number, since it uses less digits than its factorization.

28133616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 153 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 28133616 is about 5304.1131209657. The cubic root of 28133616 is about 304.1411509799.

Adding to 28133616 its reverse (61633182), we get a palindrome (89766798).

The spelling of 28133616 in words is "twenty-eight million, one hundred thirty-three thousand, six hundred sixteen".