28981100 has 36 divisors (see below), whose sum is σ = 63933408. Its totient is φ = 11400000.

The previous prime is 28981067. The next prime is 28981109. The reversal of 28981100 is 118982.

It is not an unprimeable number, because it can be changed into a prime (28981109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3725 + ... + 8475.

It is an arithmetic number, because the mean of its divisors is an integer number (1775928).

Almost surely, 2^28981100 is an apocalyptic number.

28981100 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 28981100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31966704).

28981100 is an abundant number, since it is smaller than the sum of its proper divisors (34952308).

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

28981100 is a wasteful number, since it uses less digits than its factorization.

28981100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4826 (or 4819 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 28981100 is about 5383.4097001807. The cubic root of 28981100 is about 307.1649246294.

The spelling of 28981100 in words is "twenty-eight million, nine hundred eighty-one thousand, one hundred".