80729443 has 4 divisors (see below), whose sum is σ = 81513328. Its totient is φ = 79945560.

The previous prime is 80729437. The next prime is 80729479. The reversal of 80729443 is 34492708.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80729443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80729483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391788 + ... + 391993.

It is an arithmetic number, because the mean of its divisors is an integer number (20378332).

Almost surely, 2^80729443 is an apocalyptic number.

80729443 is a deficient number, since it is larger than the sum of its proper divisors (783885).

80729443 is a wasteful number, since it uses less digits than its factorization.

80729443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783884.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 80729443 is about 8984.9564829219. The cubic root of 80729443 is about 432.1925920960.

The spelling of 80729443 in words is "eighty million, seven hundred twenty-nine thousand, four hundred forty-three".