81041996 has 24 divisors (see below), whose sum is σ = 163694496. Its totient is φ = 34387200.

The previous prime is 81041981. The next prime is 81042007. The reversal of 81041996 is 69914018.

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, 11501 + ... + 17156.

It is an arithmetic number, because the mean of its divisors is an integer number (6820604).

Almost surely, 2^81041996 is an apocalyptic number.

It is an amenable number.

81041996 is an abundant number, since it is smaller than the sum of its proper divisors (82652500).

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

81041996 is a wasteful number, since it uses less digits than its factorization.

81041996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28769 (or 28767 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 81041996 is about 9002.3328087780. The cubic root of 81041996 is about 432.7496343617.

The spelling of 81041996 in words is "eighty-one million, forty-one thousand, nine hundred ninety-six".