80667791 has 4 divisors (see below), whose sum is σ = 81466584. Its totient is φ = 79869000.

The previous prime is 80667781. The next prime is 80667793. The reversal of 80667791 is 19776608.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80667791 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 (80667793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399245 + ... + 399446.

It is an arithmetic number, because the mean of its divisors is an integer number (20366646).

Almost surely, 2^80667791 is an apocalyptic number.

80667791 is a deficient number, since it is larger than the sum of its proper divisors (798793).

80667791 is a wasteful number, since it uses less digits than its factorization.

80667791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798792.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 80667791 is about 8981.5249818725. The cubic root of 80667791 is about 432.0825441692.

The spelling of 80667791 in words is "eighty million, six hundred sixty-seven thousand, seven hundred ninety-one".