81872344 has 16 divisors (see below), whose sum is σ = 157081320. Its totient is φ = 39984000.

The previous prime is 81872339. The next prime is 81872359. The reversal of 81872344 is 44327818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118657 + ... + 119344.

Almost surely, 2^81872344 is an apocalyptic number.

It is an amenable number.

81872344 is a deficient number, since it is larger than the sum of its proper divisors (75208976).

81872344 is a wasteful number, since it uses less digits than its factorization.

81872344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238050 (or 238046 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 81872344 is about 9048.3337692638. Note that the first 3 decimals coincide. The cubic root of 81872344 is about 434.2225846850. Note that the first 3 decimals are identical.

The spelling of 81872344 in words is "eighty-one million, eight hundred seventy-two thousand, three hundred forty-four".