80891817 has 8 divisors (see below), whose sum is σ = 111575040. Its totient is φ = 52068240.

The previous prime is 80891753. The next prime is 80891819. The reversal of 80891817 is 71819808.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80891817 - 2⁶ = 80891753 is a prime.

It is a super-2 number, since 2×80891817² = 13086972115122978, which contains 22 as substring.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464809 + ... + 464982.

It is an arithmetic number, because the mean of its divisors is an integer number (13946880).

Almost surely, 2^80891817 is an apocalyptic number.

80891817 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

80891817 is a deficient number, since it is larger than the sum of its proper divisors (30683223).

80891817 is a wasteful number, since it uses less digits than its factorization.

80891817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929823.

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 80891817 is about 8993.9878252086. The cubic root of 80891817 is about 432.4821594877.

The spelling of 80891817 in words is "eighty million, eight hundred ninety-one thousand, eight hundred seventeen".