80712813 has 4 divisors (see below), whose sum is σ = 107617088. Its totient is φ = 53808540.

The previous prime is 80712811. The next prime is 80712851. The reversal of 80712813 is 31821708.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80712813 - 2¹ = 80712811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80712811) 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, 13452133 + ... + 13452138.

It is an arithmetic number, because the mean of its divisors is an integer number (26904272).

Almost surely, 2^80712813 is an apocalyptic number.

It is an amenable number.

80712813 is a deficient number, since it is larger than the sum of its proper divisors (26904275).

80712813 is a wasteful number, since it uses less digits than its factorization.

80712813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26904274.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 80712813 is about 8984.0309995013. The cubic root of 80712813 is about 432.1629133067.

The spelling of 80712813 in words is "eighty million, seven hundred twelve thousand, eight hundred thirteen".