81867292 has 12 divisors (see below), whose sum is σ = 154288456. Its totient is φ = 37784880.

The previous prime is 81867287. The next prime is 81867293. The reversal of 81867292 is 29276818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81867293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787134 + ... + 787237.

Almost surely, 2^81867292 is an apocalyptic number.

It is an amenable number.

81867292 is a deficient number, since it is larger than the sum of its proper divisors (72421164).

81867292 is a wasteful number, since it uses less digits than its factorization.

81867292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574388 (or 1574386 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 81867292 is about 9048.0545975364. The cubic root of 81867292 is about 434.2136531479.

The spelling of 81867292 in words is "eighty-one million, eight hundred sixty-seven thousand, two hundred ninety-two".