80729889720 has 64 divisors (see below), whose sum is σ = 242389113120. Its totient is φ = 21510242304.

The previous prime is 80729889719. The next prime is 80729889727. The reversal of 80729889720 is 2798892708.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80729889727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130357 + ... + 422436.

Almost surely, 2^80729889720 is an apocalyptic number.

It is an amenable number.

80729889720 is an abundant number, since it is smaller than the sum of its proper divisors (161659223400).

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

80729889720 is a wasteful number, since it uses less digits than its factorization.

80729889720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554024 (or 554020 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 60.

The spelling of 80729889720 in words is "eighty billion, seven hundred twenty-nine million, eight hundred eighty-nine thousand, seven hundred twenty".