28004280 has 64 divisors (see below), whose sum is σ = 84823200. Its totient is φ = 7395840.

The previous prime is 28004279. The next prime is 28004281. The reversal of 28004280 is 8240082.

It is an interprime number because it is at equal distance from previous prime (28004279) and next prime (28004281).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28004280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12010 + ... + 14150.

Almost surely, 2^28004280 is an apocalyptic number.

28004280 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 28004280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42411600).

28004280 is an abundant number, since it is smaller than the sum of its proper divisors (56818920).

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

28004280 is a wasteful number, since it uses less digits than its factorization.

28004280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 2260 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28004280 is about 5291.9070286618. The cubic root of 28004280 is about 303.6743685431.

The spelling of 28004280 in words is "twenty-eight million, four thousand, two hundred eighty".