28730991168 has 672 divisors, whose sum is σ = 100697385600. Its totient is φ = 7996538880.

The previous prime is 28730991143. The next prime is 28730991173. The reversal of 28730991168 is 86119903782.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 209715196 + ... + 209715332.

It is an arithmetic number, because the mean of its divisors is an integer number (149847300).

Almost surely, 2^28730991168 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 28730991168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50348692800).

28730991168 is an abundant number, since it is smaller than the sum of its proper divisors (71966394432).

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

28730991168 is a wasteful number, since it uses less digits than its factorization.

28730991168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 28730991168 in words is "twenty-eight billion, seven hundred thirty million, nine hundred ninety-one thousand, one hundred sixty-eight".