28100772 has 72 divisors (see below), whose sum is σ = 85467200. Its totient is φ = 7604928.

The previous prime is 28100767. The next prime is 28100773. The reversal of 28100772 is 27700182.

It is not an unprimeable number, because it can be changed into a prime (28100773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1854 + ... + 7722.

Almost surely, 2^28100772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28100772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42733600).

28100772 is an abundant number, since it is smaller than the sum of its proper divisors (57366428).

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

28100772 is a wasteful number, since it uses less digits than its factorization.

28100772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905 (or 5900 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 28100772 is about 5301.0161290077. The cubic root of 28100772 is about 304.0227504904.

The spelling of 28100772 in words is "twenty-eight million, one hundred thousand, seven hundred seventy-two".