28061022100 has 72 divisors (see below), whose sum is σ = 64134610400. Its totient is φ = 10627459200.

The previous prime is 28061022089. The next prime is 28061022107. The reversal of 28061022100 is 122016082.

It is a super-2 number, since 2×28061022100² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28061022107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4501786 + ... + 4508014.

Almost surely, 2^28061022100 is an apocalyptic number.

28061022100 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 28061022100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32067305200).

28061022100 is an abundant number, since it is smaller than the sum of its proper divisors (36073588300).

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

28061022100 is a wasteful number, since it uses less digits than its factorization.

28061022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8633 (or 8626 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 28061022100 its reverse (122016082), we get a palindrome (28183038182).

The spelling of 28061022100 in words is "twenty-eight billion, sixty-one million, twenty-two thousand, one hundred".