80819897 has 16 divisors (see below), whose sum is σ = 86622480. Its totient is φ = 75264000.

The previous prime is 80819873. The next prime is 80819917. The reversal of 80819897 is 79891808.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 341056 + 80478841 = 584^2 + 8971^2 .

It is a cyclic number.

It is not a de Polignac number, because 80819897 - 2¹⁰ = 80818873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80819867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119753 + ... + 120425.

It is an arithmetic number, because the mean of its divisors is an integer number (5413905).

Almost surely, 2^80819897 is an apocalyptic number.

It is an amenable number.

80819897 is a deficient number, since it is larger than the sum of its proper divisors (5802583).

80819897 is a wasteful number, since it uses less digits than its factorization.

80819897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 80819897 is about 8989.9887096703. The cubic root of 80819897 is about 432.3539498174.

The spelling of 80819897 in words is "eighty million, eight hundred nineteen thousand, eight hundred ninety-seven".