80643716 has 18 divisors (see below), whose sum is σ = 149918538. Its totient is φ = 37949440.

The previous prime is 80643697. The next prime is 80643721. The reversal of 80643716 is 61734608.

It can be written as a sum of positive squares in 3 ways, for example, as 44089600 + 36554116 = 6640^2 + 6046^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33725 + ... + 36036.

Almost surely, 2^80643716 is an apocalyptic number.

It is an amenable number.

80643716 is a deficient number, since it is larger than the sum of its proper divisors (69274822).

80643716 is a wasteful number, since it uses less digits than its factorization.

80643716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69799 (or 69780 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 80643716 is about 8980.1846306187. The cubic root of 80643716 is about 432.0395554201.

The spelling of 80643716 in words is "eighty million, six hundred forty-three thousand, seven hundred sixteen".