81195080 has 32 divisors (see below), whose sum is σ = 183219840. Its totient is φ = 32383680.

The previous prime is 81195073. The next prime is 81195091. The reversal of 81195080 is 8059118.

It is a happy 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, 11915 + ... + 17445.

It is an arithmetic number, because the mean of its divisors is an integer number (5725620).

Almost surely, 2^81195080 is an apocalyptic number.

It is an amenable number.

81195080 is an abundant number, since it is smaller than the sum of its proper divisors (102024760).

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

81195080 is a wasteful number, since it uses less digits than its factorization.

81195080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5909 (or 5905 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 81195080 is about 9010.8312602112. The cubic root of 81195080 is about 433.0219432865.

The spelling of 81195080 in words is "eighty-one million, one hundred ninety-five thousand, eighty".