28043172000 has 672 divisors, whose sum is σ = 105701319360. Its totient is φ = 7306329600.

The previous prime is 28043171983. The next prime is 28043172007. The reversal of 28043172000 is 27134082.

28043172000 is a `hidden beast` number, since 28 + 0 + 431 + 7 + 200 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28043172007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 172043919 + ... + 172044081.

It is an arithmetic number, because the mean of its divisors is an integer number (157293630).

Almost surely, 2^28043172000 is an apocalyptic number.

28043172000 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 28043172000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52850659680).

28043172000 is an abundant number, since it is smaller than the sum of its proper divisors (77658147360).

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

28043172000 is an equidigital number, since it uses as much as digits as its factorization.

28043172000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The spelling of 28043172000 in words is "twenty-eight billion, forty-three million, one hundred seventy-two thousand".