80712845 has 4 divisors (see below), whose sum is σ = 96855420. Its totient is φ = 64570272.

The previous prime is 80712811. The next prime is 80712851. The reversal of 80712845 is 54821708.

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 16760836 + 63952009 = 4094^2 + 7997^2 .

It is a cyclic number.

It is not a de Polignac number, because 80712845 - 2⁶ = 80712781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8071280 + ... + 8071289.

It is an arithmetic number, because the mean of its divisors is an integer number (24213855).

Almost surely, 2^80712845 is an apocalyptic number.

It is an amenable number.

80712845 is a deficient number, since it is larger than the sum of its proper divisors (16142575).

80712845 is a wasteful number, since it uses less digits than its factorization.

80712845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16142574.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 80712845 is about 8984.0327804389. The cubic root of 80712845 is about 432.1629704196.

The spelling of 80712845 in words is "eighty million, seven hundred twelve thousand, eight hundred forty-five".