81243704 has 32 divisors (see below), whose sum is σ = 155719200. Its totient is φ = 39726720.

The previous prime is 81243661. The next prime is 81243713. The reversal of 81243704 is 40734218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111389 + ... + 112115.

It is an arithmetic number, because the mean of its divisors is an integer number (4866225).

Almost surely, 2^81243704 is an apocalyptic number.

It is an amenable number.

81243704 is a deficient number, since it is larger than the sum of its proper divisors (74475496).

81243704 is a wasteful number, since it uses less digits than its factorization.

81243704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 81243704 is about 9013.5289426506. The cubic root of 81243704 is about 433.1083650145.

The spelling of 81243704 in words is "eighty-one million, two hundred forty-three thousand, seven hundred four".