28998180 has 144 divisors (see below), whose sum is σ = 94785600. Its totient is φ = 7153920.

The previous prime is 28998169. The next prime is 28998187. The reversal of 28998180 is 8189982.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28998187) 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 47 ways as a sum of consecutive naturals, for example, 208551 + ... + 208689.

Almost surely, 2^28998180 is an apocalyptic number.

28998180 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 28998180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47392800).

28998180 is an abundant number, since it is smaller than the sum of its proper divisors (65787420).

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

28998180 is a wasteful number, since it uses less digits than its factorization.

28998180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 28998180 is about 5384.9958217254. The cubic root of 28998180 is about 307.2252552886.

Adding to 28998180 its sum of digits (45), we get a square (28998225 = 5385²).

The spelling of 28998180 in words is "twenty-eight million, nine hundred ninety-eight thousand, one hundred eighty".