81740044 has 12 divisors (see below), whose sum is σ = 143374000. Its totient is φ = 40776048.

The previous prime is 81740041. The next prime is 81740053. The reversal of 81740044 is 44004718.

It is a junction number, because it is equal to n+sod(n) for n = 81739994 and 81740021.

It is not an unprimeable number, because it can be changed into a prime (81740041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21519 + ... + 25030.

Almost surely, 2^81740044 is an apocalyptic number.

It is an amenable number.

81740044 is a deficient number, since it is larger than the sum of its proper divisors (61633956).

81740044 is a wasteful number, since it uses less digits than its factorization.

81740044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46992 (or 46990 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 81740044 is about 9041.0200751906. The cubic root of 81740044 is about 433.9885674464.

The spelling of 81740044 in words is "eighty-one million, seven hundred forty thousand, forty-four".