81368984 has 16 divisors (see below), whose sum is σ = 153208800. Its totient is φ = 40513312.

The previous prime is 81368977. The next prime is 81368999. The reversal of 81368984 is 48986318.

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, 19367 + ... + 23190.

It is an arithmetic number, because the mean of its divisors is an integer number (9575550).

Almost surely, 2^81368984 is an apocalyptic number.

It is an amenable number.

81368984 is a deficient number, since it is larger than the sum of its proper divisors (71839816).

81368984 is a wasteful number, since it uses less digits than its factorization.

81368984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42802 (or 42798 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 81368984 is about 9020.4758189355. The cubic root of 81368984 is about 433.3308723069.

The spelling of 81368984 in words is "eighty-one million, three hundred sixty-eight thousand, nine hundred eighty-four".