28547280 has 120 divisors (see below), whose sum is σ = 99041280. Its totient is φ = 7361280.

The previous prime is 28547273. The next prime is 28547287. The reversal of 28547280 is 8274582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28547273) and next prime (28547287).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28547287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21681 + ... + 22959.

It is an arithmetic number, because the mean of its divisors is an integer number (825344).

Almost surely, 2^28547280 is an apocalyptic number.

28547280 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 28547280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49520640).

28547280 is an abundant number, since it is smaller than the sum of its proper divisors (70494000).

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

28547280 is a wasteful number, since it uses less digits than its factorization.

28547280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329 (or 1320 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28547280 is about 5342.9654687261. The cubic root of 28547280 is about 305.6245555591.

The spelling of 28547280 in words is "twenty-eight million, five hundred forty-seven thousand, two hundred eighty".