80784981 has 12 divisors (see below), whose sum is σ = 120713580. Its totient is φ = 51999360.

The previous prime is 80784973. The next prime is 80785009. The reversal of 80784981 is 18948708.

It can be written as a sum of positive squares in 2 ways, for example, as 40259025 + 40525956 = 6345^2 + 6366^2 .

It is not a de Polignac number, because 80784981 - 2³ = 80784973 is a prime.

It is a super-2 number, since 2×80784981² = 13052426310340722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80784931) 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 11 ways as a sum of consecutive naturals, for example, 154500 + ... + 155021.

It is an arithmetic number, because the mean of its divisors is an integer number (10059465).

Almost surely, 2^80784981 is an apocalyptic number.

It is an amenable number.

80784981 is a deficient number, since it is larger than the sum of its proper divisors (39928599).

80784981 is a wasteful number, since it uses less digits than its factorization.

80784981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309556 (or 309553 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 80784981 is about 8988.0465619622. The cubic root of 80784981 is about 432.2916786625.

The spelling of 80784981 in words is "eighty million, seven hundred eighty-four thousand, nine hundred eighty-one".