81084936 has 32 divisors (see below), whose sum is σ = 211527360. Its totient is φ = 25852992.

The previous prime is 81084931. The next prime is 81084937. The reversal of 81084936 is 63948018.

It is a super-2 number, since 2×81084936² = 13149533692248192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81084894 and 81084903.

It is not an unprimeable number, because it can be changed into a prime (81084931) 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, 72895 + ... + 73998.

It is an arithmetic number, because the mean of its divisors is an integer number (6610230).

Almost surely, 2^81084936 is an apocalyptic number.

It is an amenable number.

81084936 is an abundant number, since it is smaller than the sum of its proper divisors (130442424).

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

81084936 is a wasteful number, since it uses less digits than its factorization.

81084936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146925 (or 146921 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 81084936 is about 9004.7174303251. The cubic root of 81084936 is about 432.8260514839.

The spelling of 81084936 in words is "eighty-one million, eighty-four thousand, nine hundred thirty-six".