80891816 has 16 divisors (see below), whose sum is σ = 159655200. Its totient is φ = 38317104.

The previous prime is 80891753. The next prime is 80891819. The reversal of 80891816 is 61819808.

It is not an unprimeable number, because it can be changed into a prime (80891819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265940 + ... + 266243.

It is an arithmetic number, because the mean of its divisors is an integer number (9978450).

Almost surely, 2^80891816 is an apocalyptic number.

It is an amenable number.

80891816 is a deficient number, since it is larger than the sum of its proper divisors (78763384).

80891816 is a wasteful number, since it uses less digits than its factorization.

80891816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532208 (or 532204 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 80891816 is about 8993.9877696159. The cubic root of 80891816 is about 432.4821577056.

The spelling of 80891816 in words is "eighty million, eight hundred ninety-one thousand, eight hundred sixteen".