81059960 has 32 divisors (see below), whose sum is σ = 186269760. Its totient is φ = 31733376.

The previous prime is 81059941. The next prime is 81059969. The reversal of 81059960 is 6995018.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81059969) 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, 19679 + ... + 23438.

It is an arithmetic number, because the mean of its divisors is an integer number (5820930).

Almost surely, 2^81059960 is an apocalyptic number.

It is an amenable number.

81059960 is an abundant number, since it is smaller than the sum of its proper divisors (105209800).

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

81059960 is a wasteful number, since it uses less digits than its factorization.

81059960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43175 (or 43171 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 81059960 is about 9003.3304948780. The cubic root of 81059960 is about 432.7816068389.

The spelling of 81059960 in words is "eighty-one million, fifty-nine thousand, nine hundred sixty".