80766891 has 18 divisors (see below), whose sum is σ = 123131580. Its totient is φ = 51008616.

The previous prime is 80766883. The next prime is 80766899. The reversal of 80766891 is 19866708.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (80766883) and next prime (80766899).

It is not a de Polignac number, because 80766891 - 2³ = 80766883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80766899) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9181 + ... + 15678.

Almost surely, 2^80766891 is an apocalyptic number.

80766891 is a deficient number, since it is larger than the sum of its proper divisors (42364689).

80766891 is a wasteful number, since it uses less digits than its factorization.

80766891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24903 (or 24881 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 80766891 is about 8987.0401690434. The cubic root of 80766891 is about 432.2594088843.

The spelling of 80766891 in words is "eighty million, seven hundred sixty-six thousand, eight hundred ninety-one".