28664280 has 112 divisors (see below), whose sum is σ = 96796080. Its totient is φ = 7636032.

The previous prime is 28664257. The next prime is 28664287. The reversal of 28664280 is 8246682.

28664280 is a `hidden beast` number, since 2 + 8 + 6 + 642 + 8 + 0 = 666.

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 (28664287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 28669 + ... + 29651.

Almost surely, 2^28664280 is an apocalyptic number.

28664280 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 28664280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48398040).

28664280 is an abundant number, since it is smaller than the sum of its proper divisors (68131800).

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

28664280 is an equidigital number, since it uses as much as digits as its factorization.

28664280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28664280 is about 5353.9032490324. The cubic root of 28664280 is about 306.0415168583.

The spelling of 28664280 in words is "twenty-eight million, six hundred sixty-four thousand, two hundred eighty".