28298880 has 192 divisors, whose sum is σ = 103825800. Its totient is φ = 7102464.

The previous prime is 28298869. The next prime is 28298899. The reversal of 28298880 is 8889282.

It can be written as a sum of positive squares in 4 ways, for example, as 23736384 + 4562496 = 4872^2 + 2136^2 .

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1664632 + ... + 1664648.

Almost surely, 2^28298880 is an apocalyptic number.

28298880 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 28298880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51912900).

28298880 is an abundant number, since it is smaller than the sum of its proper divisors (75526920).

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

28298880 is an equidigital number, since it uses as much as digits as its factorization.

28298880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 28298880 is about 5319.6691626454. The cubic root of 28298880 is about 304.7355227659.

The spelling of 28298880 in words is "twenty-eight million, two hundred ninety-eight thousand, eight hundred eighty".