81303980 has 12 divisors (see below), whose sum is σ = 170738400. Its totient is φ = 32521584.

The previous prime is 81303973. The next prime is 81304009. The reversal of 81303980 is 8930318.

It is a super-2 number, since 2×81303980² = 13220674327680800, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2032580 + ... + 2032619.

It is an arithmetic number, because the mean of its divisors is an integer number (14228200).

Almost surely, 2^81303980 is an apocalyptic number.

It is an amenable number.

81303980 is an abundant number, since it is smaller than the sum of its proper divisors (89434420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81303980 is a wasteful number, since it uses less digits than its factorization.

81303980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065208 (or 4065206 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 81303980 is about 9016.8719631588. The cubic root of 81303980 is about 433.2154485382.

The spelling of 81303980 in words is "eighty-one million, three hundred three thousand, nine hundred eighty".