28273230072 has 96 divisors (see below), whose sum is σ = 79314861600. Its totient is φ = 9087821568.

The previous prime is 28273230059. The next prime is 28273230091. The reversal of 28273230072 is 27003237282.

28273230072 is a `hidden beast` number, since 282 + 7 + 3 + 2 + 300 + 72 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1710198 + ... + 1726650.

It is an arithmetic number, because the mean of its divisors is an integer number (826196475).

Almost surely, 2^28273230072 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 28273230072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39657430800).

28273230072 is an abundant number, since it is smaller than the sum of its proper divisors (51041631528).

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

28273230072 is a wasteful number, since it uses less digits than its factorization.

28273230072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17317 (or 17310 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The spelling of 28273230072 in words is "twenty-eight billion, two hundred seventy-three million, two hundred thirty thousand, seventy-two".