28273280 has 64 divisors (see below), whose sum is σ = 77258880. Its totient is φ = 9692160.

The previous prime is 28273277. The next prime is 28273283. The reversal of 28273280 is 8237282.

It is an interprime number because it is at equal distance from previous prime (28273277) and next prime (28273283).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (28273283) 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, 1325 + ... + 7635.

It is an arithmetic number, because the mean of its divisors is an integer number (1207170).

Almost surely, 2^28273280 is an apocalyptic number.

28273280 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 28273280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38629440).

28273280 is an abundant number, since it is smaller than the sum of its proper divisors (48985600).

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

28273280 is an equidigital number, since it uses as much as digits as its factorization.

28273280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337 (or 6325 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28273280 is about 5317.2624535563. The cubic root of 28273280 is about 304.6436041343.

The spelling of 28273280 in words is "twenty-eight million, two hundred seventy-three thousand, two hundred eighty".