80736727920 has 80 divisors (see below), whose sum is σ = 250397306880. Its totient is φ = 21520035072.

The previous prime is 80736727849. The next prime is 80736727927. The reversal of 80736727920 is 2972763708.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80736727927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462237 + ... + 612483.

It is an arithmetic number, because the mean of its divisors is an integer number (3129966336).

Almost surely, 2^80736727920 is an apocalyptic number.

80736727920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80736727920 is an abundant number, since it is smaller than the sum of its proper divisors (169660578960).

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

80736727920 is a wasteful number, since it uses less digits than its factorization.

80736727920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152502 (or 152496 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 51.

The spelling of 80736727920 in words is "eighty billion, seven hundred thirty-six million, seven hundred twenty-seven thousand, nine hundred twenty".