80720555 has 8 divisors (see below), whose sum is σ = 98506800. Its totient is φ = 63481696.

The previous prime is 80720527. The next prime is 80720567. The reversal of 80720555 is 55502708.

It is a happy number.

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 80720555 - 2⁶ = 80720491 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136520 + ... + 137109.

It is an arithmetic number, because the mean of its divisors is an integer number (12313350).

Almost surely, 2^80720555 is an apocalyptic number.

80720555 is a deficient number, since it is larger than the sum of its proper divisors (17786245).

80720555 is a wasteful number, since it uses less digits than its factorization.

80720555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273693.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 80720555 is about 8984.4618647975. The cubic root of 80720555 is about 432.1767306020.

The spelling of 80720555 in words is "eighty million, seven hundred twenty thousand, five hundred fifty-five".