80981812 has 24 divisors (see below), whose sum is σ = 151751880. Its totient is φ = 37678080.

The previous prime is 80981809. The next prime is 80981821. The reversal of 80981812 is 21818908.

80981812 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 4 ways, for example, as 2056356 + 78925456 = 1434^2 + 8884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639 + ... + 12742.

It is an arithmetic number, because the mean of its divisors is an integer number (6322995).

Almost surely, 2^80981812 is an apocalyptic number.

It is an amenable number.

80981812 is a deficient number, since it is larger than the sum of its proper divisors (70770068).

80981812 is a wasteful number, since it uses less digits than its factorization.

80981812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13491 (or 13489 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 80981812 is about 8998.9894988271. The cubic root of 80981812 is about 432.6424839332.

It can be divided in two parts, 809 and 81812, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 80981812 in words is "eighty million, nine hundred eighty-one thousand, eight hundred twelve".