81586196 has 24 divisors (see below), whose sum is σ = 151502400. Its totient is φ = 38310272.

The previous prime is 81586181. The next prime is 81586207. The reversal of 81586196 is 69168518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39731 + ... + 41733.

It is an arithmetic number, because the mean of its divisors is an integer number (6312600).

Almost surely, 2^81586196 is an apocalyptic number.

It is an amenable number.

81586196 is a deficient number, since it is larger than the sum of its proper divisors (69916204).

81586196 is a wasteful number, since it uses less digits than its factorization.

81586196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 2621 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 81586196 is about 9032.5077359502. The cubic root of 81586196 is about 433.7161175215.

The spelling of 81586196 in words is "eighty-one million, five hundred eighty-six thousand, one hundred ninety-six".