81759196 has 24 divisors (see below), whose sum is σ = 148102416. Its totient is φ = 39461760.

The previous prime is 81759173. The next prime is 81759221. The reversal of 81759196 is 69195718.

It is a happy number.

It is a super-2 number, since 2×81759196² = 13369132261132832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17280 + ... + 21496.

It is an arithmetic number, because the mean of its divisors is an integer number (6170934).

Almost surely, 2^81759196 is an apocalyptic number.

It is an amenable number.

81759196 is a deficient number, since it is larger than the sum of its proper divisors (66343220).

81759196 is a wasteful number, since it uses less digits than its factorization.

81759196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389 (or 4387 counting only the distinct ones).

The product of its digits is 136080, while the sum is 46.

The square root of 81759196 is about 9042.0791856741. The cubic root of 81759196 is about 434.0224598512.

It can be divided in two parts, 8175 and 9196, that added together give a palindrome (17371).

The spelling of 81759196 in words is "eighty-one million, seven hundred fifty-nine thousand, one hundred ninety-six".