80649071 has 4 divisors (see below), whose sum is σ = 85393152. Its totient is φ = 75904992.

The previous prime is 80649067. The next prime is 80649077. The reversal of 80649071 is 17094608.

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

It is a cyclic number.

It is not a de Polignac number, because 80649071 - 2² = 80649067 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80649077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2372015 + ... + 2372048.

It is an arithmetic number, because the mean of its divisors is an integer number (21348288).

Almost surely, 2^80649071 is an apocalyptic number.

80649071 is a deficient number, since it is larger than the sum of its proper divisors (4744081).

80649071 is a wasteful number, since it uses less digits than its factorization.

80649071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744080.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 80649071 is about 8980.4827821226. The cubic root of 80649071 is about 432.0491181434.

The spelling of 80649071 in words is "eighty million, six hundred forty-nine thousand, seventy-one".