80720815 has 8 divisors (see below), whose sum is σ = 110702880. Its totient is φ = 55351392.

The previous prime is 80720813. The next prime is 80720821. The reversal of 80720815 is 51802708.

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 80720815 - 2¹ = 80720813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80720813) 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, 1153120 + ... + 1153189.

It is an arithmetic number, because the mean of its divisors is an integer number (13837860).

Almost surely, 2^80720815 is an apocalyptic number.

80720815 is a deficient number, since it is larger than the sum of its proper divisors (29982065).

80720815 is a wasteful number, since it uses less digits than its factorization.

80720815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306321.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 80720815 is about 8984.4763342111. The cubic root of 80720815 is about 432.1771946136.

The spelling of 80720815 in words is "eighty million, seven hundred twenty thousand, eight hundred fifteen".