81829936 has 20 divisors (see below), whose sum is σ = 159759864. Its totient is φ = 40601600.

The previous prime is 81829931. The next prime is 81829997. The reversal of 81829936 is 63992818.

It is a super-3 number, since 3×81829936³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (81829931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17425 + ... + 21616.

Almost surely, 2^81829936 is an apocalyptic number.

It is an amenable number.

81829936 is a deficient number, since it is larger than the sum of its proper divisors (77929928).

81829936 is a wasteful number, since it uses less digits than its factorization.

81829936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39180 (or 39174 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 81829936 is about 9045.9900508457. The cubic root of 81829936 is about 434.1475992836.

The spelling of 81829936 in words is "eighty-one million, eight hundred twenty-nine thousand, nine hundred thirty-six".