81080487 has 8 divisors (see below), whose sum is σ = 120119280. Its totient is φ = 54053640.

The previous prime is 81080479. The next prime is 81080537. The reversal of 81080487 is 78408018.

It is not a de Polignac number, because 81080487 - 2³ = 81080479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080387) 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 7 ways as a sum of consecutive naturals, for example, 1501464 + ... + 1501517.

It is an arithmetic number, because the mean of its divisors is an integer number (15014910).

Almost surely, 2^81080487 is an apocalyptic number.

81080487 is a deficient number, since it is larger than the sum of its proper divisors (39038793).

81080487 is a wasteful number, since it uses less digits than its factorization.

81080487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002990 (or 3002984 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 81080487 is about 9004.4703897564. The cubic root of 81080487 is about 432.8181351827.

The spelling of 81080487 in words is "eighty-one million, eighty thousand, four hundred eighty-seven".