8190991728 has 160 divisors (see below), whose sum is σ = 23877400320. Its totient is φ = 2688134400.

The previous prime is 8190991727. The next prime is 8190991741. The reversal of 8190991728 is 8271990918.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8190991727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9904051 + ... + 9904877.

It is an arithmetic number, because the mean of its divisors is an integer number (149233752).

Almost surely, 2^8190991728 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 8190991728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11938700160).

8190991728 is an abundant number, since it is smaller than the sum of its proper divisors (15686408592).

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

8190991728 is a wasteful number, since it uses less digits than its factorization.

8190991728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 8190991728 is about 90504.0978519757. The cubic root of 8190991728 is about 2015.7909718085.

The spelling of 8190991728 in words is "eight billion, one hundred ninety million, nine hundred ninety-one thousand, seven hundred twenty-eight".