80819990 has 16 divisors (see below), whose sum is σ = 145754640. Its totient is φ = 32266080.

The previous prime is 80819987. The next prime is 80820017. The reversal of 80819990 is 9991808.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2060 + ... + 12879.

It is an arithmetic number, because the mean of its divisors is an integer number (9109665).

Almost surely, 2^80819990 is an apocalyptic number.

80819990 is a deficient number, since it is larger than the sum of its proper divisors (64934650).

80819990 is a wasteful number, since it uses less digits than its factorization.

80819990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15487.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 80819990 is about 8989.9938820891. The cubic root of 80819990 is about 432.3541156549.

The spelling of 80819990 in words is "eighty million, eight hundred nineteen thousand, nine hundred ninety".