80556745 has 4 divisors (see below), whose sum is σ = 96668100. Its totient is φ = 64445392.

The previous prime is 80556739. The next prime is 80556779. The reversal of 80556745 is 54765508.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55636681 + 24920064 = 7459^2 + 4992^2 .

It is a cyclic number.

It is not a de Polignac number, because 80556745 - 2³ = 80556737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80556698 and 80556707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8055670 + ... + 8055679.

It is an arithmetic number, because the mean of its divisors is an integer number (24167025).

Almost surely, 2^80556745 is an apocalyptic number.

It is an amenable number.

80556745 is a deficient number, since it is larger than the sum of its proper divisors (16111355).

80556745 is a wasteful number, since it uses less digits than its factorization.

80556745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16111354.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 80556745 is about 8975.3409405994. The cubic root of 80556745 is about 431.8841871335.

The spelling of 80556745 in words is "eighty million, five hundred fifty-six thousand, seven hundred forty-five".