28621233900 has 576 divisors, whose sum is σ = 110326272000. Its totient is φ = 6227020800.

The previous prime is 28621233877. The next prime is 28621233911. The reversal of 28621233900 is 933212682.

28621233900 is a `hidden beast` number, since 2 + 8 + 621 + 23 + 3 + 9 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 43299570 + ... + 43300230.

Almost surely, 2^28621233900 is an apocalyptic number.

28621233900 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 28621233900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55163136000).

28621233900 is an abundant number, since it is smaller than the sum of its proper divisors (81705038100).

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

28621233900 is a wasteful number, since it uses less digits than its factorization.

28621233900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 28621233900 in words is "twenty-eight billion, six hundred twenty-one million, two hundred thirty-three thousand, nine hundred".