80724691 has 4 divisors (see below), whose sum is σ = 81631800. Its totient is φ = 79817584.

The previous prime is 80724607. The next prime is 80724697. The reversal of 80724691 is 19642708.

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

It is a cyclic number.

It is not a de Polignac number, because 80724691 - 2⁷ = 80724563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80724691.

It is not an unprimeable number, because it can be changed into a prime (80724697) 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, 453421 + ... + 453598.

It is an arithmetic number, because the mean of its divisors is an integer number (20407950).

Almost surely, 2^80724691 is an apocalyptic number.

80724691 is a deficient number, since it is larger than the sum of its proper divisors (907109).

80724691 is an equidigital number, since it uses as much as digits as its factorization.

80724691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907108.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 80724691 is about 8984.6920370150. The cubic root of 80724691 is about 432.1841118381.

The spelling of 80724691 in words is "eighty million, seven hundred twenty-four thousand, six hundred ninety-one".