81715672 has 16 divisors (see below), whose sum is σ = 153343800. Its totient is φ = 40824000.

The previous prime is 81715639. The next prime is 81715691. The reversal of 81715672 is 27651718.

It is a super-3 number, since 3×81715672³ (a number of 25 digits) contains 333 as substring.

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, 8172 + ... + 15172.

Almost surely, 2^81715672 is an apocalyptic number.

It is an amenable number.

81715672 is a deficient number, since it is larger than the sum of its proper divisors (71628128).

81715672 is a wasteful number, since it uses less digits than its factorization.

81715672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8466 (or 8462 counting only the distinct ones).

The product of its digits is 23520, while the sum is 37.

The square root of 81715672 is about 9039.6721179476. The cubic root of 81715672 is about 433.9454297942.

The spelling of 81715672 in words is "eighty-one million, seven hundred fifteen thousand, six hundred seventy-two".