81860132 has 48 divisors (see below), whose sum is σ = 158706240. Its totient is φ = 36796032.

The previous prime is 81860111. The next prime is 81860137. The reversal of 81860132 is 23106818.

It is a super-2 number, since 2×81860132² = 13402162422114848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81860095 and 81860104.

It is not an unprimeable number, because it can be changed into a prime (81860137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120578 + ... + 121254.

It is an arithmetic number, because the mean of its divisors is an integer number (3306380).

Almost surely, 2^81860132 is an apocalyptic number.

It is an amenable number.

81860132 is a deficient number, since it is larger than the sum of its proper divisors (76846108).

81860132 is a wasteful number, since it uses less digits than its factorization.

81860132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81860132 is about 9047.6589237216. The cubic root of 81860132 is about 434.2009942039.

The spelling of 81860132 in words is "eighty-one million, eight hundred sixty thousand, one hundred thirty-two".