81713028 has 24 divisors (see below), whose sum is σ = 191001888. Its totient is φ = 27189376.

The previous prime is 81712991. The next prime is 81713063. The reversal of 81713028 is 82031718.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81712986 and 81713004.

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, 1375 + ... + 12857.

It is an arithmetic number, because the mean of its divisors is an integer number (7958412).

Almost surely, 2^81713028 is an apocalyptic number.

It is an amenable number.

81713028 is an abundant number, since it is smaller than the sum of its proper divisors (109288860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81713028 is a wasteful number, since it uses less digits than its factorization.

81713028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12083 (or 12081 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81713028 is about 9039.5258725223. The cubic root of 81713028 is about 433.9407494839.

The spelling of 81713028 in words is "eighty-one million, seven hundred thirteen thousand, twenty-eight".