28137280 has 56 divisors (see below), whose sum is σ = 69933312. Its totient is φ = 10762752.

The previous prime is 28137259. The next prime is 28137281. The reversal of 28137280 is 8273182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28137281) 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, 5449 + ... + 9271.

Almost surely, 2^28137280 is an apocalyptic number.

28137280 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 28137280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34966656).

28137280 is an abundant number, since it is smaller than the sum of its proper divisors (41796032).

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

28137280 is a wasteful number, since it uses less digits than its factorization.

28137280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863 (or 3853 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28137280 is about 5304.4585020528. The cubic root of 28137280 is about 304.1543537477.

The spelling of 28137280 in words is "twenty-eight million, one hundred thirty-seven thousand, two hundred eighty".