28032188940 has 192 divisors, whose sum is σ = 99786086400. Its totient is φ = 6399896832.

The previous prime is 28032188939. The next prime is 28032188969. The reversal of 28032188940 is 4988123082.

28032188940 is a `hidden beast` number, since 280 + 321 + 8 + 8 + 9 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3651426 + ... + 3659094.

It is an arithmetic number, because the mean of its divisors is an integer number (519719200).

Almost surely, 2^28032188940 is an apocalyptic number.

28032188940 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 28032188940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49893043200).

28032188940 is an abundant number, since it is smaller than the sum of its proper divisors (71753897460).

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

28032188940 is a wasteful number, since it uses less digits than its factorization.

28032188940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8661 (or 8653 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 28032188940 in words is "twenty-eight billion, thirty-two million, one hundred eighty-eight thousand, nine hundred forty".