81085576 has 32 divisors (see below), whose sum is σ = 178617600. Its totient is φ = 34021440.

The previous prime is 81085549. The next prime is 81085579. The reversal of 81085576 is 67558018.

It is not an unprimeable number, because it can be changed into a prime (81085579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34296 + ... + 36583.

It is an arithmetic number, because the mean of its divisors is an integer number (5581800).

Almost surely, 2^81085576 is an apocalyptic number.

It is an amenable number.

81085576 is an abundant number, since it is smaller than the sum of its proper divisors (97532024).

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

81085576 is a wasteful number, since it uses less digits than its factorization.

81085576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70909 (or 70905 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 81085576 is about 9004.7529671835. The cubic root of 81085576 is about 432.8271902402.

The spelling of 81085576 in words is "eighty-one million, eighty-five thousand, five hundred seventy-six".