80726641920 has 216 divisors, whose sum is σ = 280637945952. Its totient is φ = 21424435200.

The previous prime is 80726641909. The next prime is 80726641939. The reversal of 80726641920 is 2914662708.

It is a happy number.

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

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, 2414115 + ... + 2447325.

Almost surely, 2^80726641920 is an apocalyptic number.

80726641920 is a gapful number since it is divisible by the number (80) 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 80726641920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140318972976).

80726641920 is an abundant number, since it is smaller than the sum of its proper divisors (199911304032).

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

80726641920 is a wasteful number, since it uses less digits than its factorization.

80726641920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33449 (or 33432 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 80726641920 in words is "eighty billion, seven hundred twenty-six million, six hundred forty-one thousand, nine hundred twenty".