80736721 has 8 divisors (see below), whose sum is σ = 88421760. Its totient is φ = 73262352.

The previous prime is 80736661. The next prime is 80736731. The reversal of 80736721 is 12763708.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80736721 - 2⁹ = 80736209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80736731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51865 + ... + 53398.

It is an arithmetic number, because the mean of its divisors is an integer number (11052720).

Almost surely, 2^80736721 is an apocalyptic number.

It is an amenable number.

80736721 is a deficient number, since it is larger than the sum of its proper divisors (7685039).

80736721 is a wasteful number, since it uses less digits than its factorization.

80736721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105335.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 80736721 is about 8985.3614841029. The cubic root of 80736721 is about 432.2055795227.

The spelling of 80736721 in words is "eighty million, seven hundred thirty-six thousand, seven hundred twenty-one".