81927936 has 126 divisors (see below), whose sum is σ = 245750120. Its totient is φ = 27247104.

The previous prime is 81927917. The next prime is 81927959. The reversal of 81927936 is 63972918.

It is a junction number, because it is equal to n+sod(n) for n = 81927891 and 81927900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 186405 + ... + 186843.

Almost surely, 2^81927936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81927936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122875060).

81927936 is an abundant number, since it is smaller than the sum of its proper divisors (163822184).

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

81927936 is an frugal number, since it uses more digits than its factorization.

81927936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 444 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 81927936 is about 9051.4051947750. The cubic root of 81927936 is about 434.3208426934.

The spelling of 81927936 in words is "eighty-one million, nine hundred twenty-seven thousand, nine hundred thirty-six".