81080085 has 16 divisors (see below), whose sum is σ = 134202240. Its totient is φ = 41751360.

The previous prime is 81080081. The next prime is 81080107. The reversal of 81080085 is 58008018.

It is not a de Polignac number, because 81080085 - 2² = 81080081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92761 + ... + 93630.

It is an arithmetic number, because the mean of its divisors is an integer number (8387640).

Almost surely, 2^81080085 is an apocalyptic number.

It is an amenable number.

81080085 is a deficient number, since it is larger than the sum of its proper divisors (53122155).

81080085 is a wasteful number, since it uses less digits than its factorization.

81080085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186428.

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 81080085 is about 9004.4480674831. The cubic root of 81080085 is about 432.8174198722.

The spelling of 81080085 in words is "eighty-one million, eighty thousand, eighty-five".