28481100 has 72 divisors (see below), whose sum is σ = 83119680. Its totient is φ = 7529280.

The previous prime is 28481077. The next prime is 28481113. The reversal of 28481100 is 118482.

It is a super-2 number, since 2×28481100² = 1622346114420000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41359 + ... + 42041.

It is an arithmetic number, because the mean of its divisors is an integer number (1154440).

Almost surely, 2^28481100 is an apocalyptic number.

28481100 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 28481100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41559840).

28481100 is an abundant number, since it is smaller than the sum of its proper divisors (54638580).

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

28481100 is a wasteful number, since it uses less digits than its factorization.

28481100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 28481100 is about 5336.7686852626. The cubic root of 28481100 is about 305.3882004886.

Adding to 28481100 its reverse (118482), we get a palindrome (28599582).

The spelling of 28481100 in words is "twenty-eight million, four hundred eighty-one thousand, one hundred".