28989180 has 108 divisors (see below), whose sum is σ = 96727176. Its totient is φ = 7027680.

The previous prime is 28989157. The next prime is 28989197. The reversal of 28989180 is 8198982.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2635375 + ... + 2635385.

It is an arithmetic number, because the mean of its divisors is an integer number (895622).

Almost surely, 2^28989180 is an apocalyptic number.

28989180 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 28989180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48363588).

28989180 is an abundant number, since it is smaller than the sum of its proper divisors (67737996).

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

28989180 is an equidigital number, since it uses as much as digits as its factorization.

28989180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 21 counting only the distinct ones).

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

The square root of 28989180 is about 5384.1601016315. The cubic root of 28989180 is about 307.1934680821.

The spelling of 28989180 in words is "twenty-eight million, nine hundred eighty-nine thousand, one hundred eighty".