28871680 has 44 divisors (see below), whose sum is σ = 69270480. Its totient is φ = 11546624.

The previous prime is 28871671. The next prime is 28871681. The reversal of 28871680 is 8617882.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (28871681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2301 + ... + 7939.

Almost surely, 2^28871680 is an apocalyptic number.

28871680 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 28871680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34635240).

28871680 is an abundant number, since it is smaller than the sum of its proper divisors (40398800).

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

28871680 is an equidigital number, since it uses as much as digits as its factorization.

28871680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664 (or 5646 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28871680 is about 5373.2373854130. The cubic root of 28871680 is about 306.7778634771. Note that the first 3 decimals are identical.

The spelling of 28871680 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred eighty".