81231704 has 16 divisors (see below), whose sum is σ = 152409120. Its totient is φ = 40589280.

The previous prime is 81231679. The next prime is 81231737. The reversal of 81231704 is 40713218.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16934 + ... + 21194.

It is an arithmetic number, because the mean of its divisors is an integer number (9525570).

Almost surely, 2^81231704 is an apocalyptic number.

It is an amenable number.

81231704 is a deficient number, since it is larger than the sum of its proper divisors (71177416).

81231704 is a wasteful number, since it uses less digits than its factorization.

81231704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650 (or 6646 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81231704 is about 9012.8632520415. The cubic root of 81231704 is about 433.0870400542.

The spelling of 81231704 in words is "eighty-one million, two hundred thirty-one thousand, seven hundred four".