28111680 has 168 divisors, whose sum is σ = 99376992. Its totient is φ = 7289856.

The previous prime is 28111679. The next prime is 28111709. The reversal of 28111680 is 8611182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123727 + ... + 123953.

Almost surely, 2^28111680 is an apocalyptic number.

28111680 is a gapful number since it is divisible by the number (20) 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 28111680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49688496).

28111680 is an abundant number, since it is smaller than the sum of its proper divisors (71265312).

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

28111680 is a wasteful number, since it uses less digits than its factorization.

28111680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 28111680 is about 5302.0448885312. The cubic root of 28111680 is about 304.0620833499.

The spelling of 28111680 in words is "twenty-eight million, one hundred eleven thousand, six hundred eighty".