81968150 has 24 divisors (see below), whose sum is σ = 166321944. Its totient is φ = 29806400.

The previous prime is 81968149. The next prime is 81968153. The reversal of 81968150 is 5186918.

It is a super-2 number, since 2×81968150² = 13437555228845000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81968153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73967 + ... + 75066.

It is an arithmetic number, because the mean of its divisors is an integer number (6930081).

Almost surely, 2^81968150 is an apocalyptic number.

81968150 is an abundant number, since it is smaller than the sum of its proper divisors (84353794).

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

81968150 is a wasteful number, since it uses less digits than its factorization.

81968150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149056 (or 149051 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 81968150 is about 9053.6263452829. The cubic root of 81968150 is about 434.3918926198.

The spelling of 81968150 in words is "eighty-one million, nine hundred sixty-eight thousand, one hundred fifty".