81966592 has 20 divisors (see below), whose sum is σ = 163774116. Its totient is φ = 40983040.

The previous prime is 81966559. The next prime is 81966611. The reversal of 81966592 is 29566918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79534 + ... + 80557.

Almost surely, 2^81966592 is an apocalyptic number.

It is an amenable number.

81966592 is a deficient number, since it is larger than the sum of its proper divisors (81807524).

81966592 is an equidigital number, since it uses as much as digits as its factorization.

81966592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160109 (or 160093 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 81966592 is about 9053.5403020034. The cubic root of 81966592 is about 434.3891403847.

The spelling of 81966592 in words is "eighty-one million, nine hundred sixty-six thousand, five hundred ninety-two".