81708576 has 24 divisors (see below), whose sum is σ = 214485264. Its totient is φ = 27236160.

The previous prime is 81708553. The next prime is 81708587. The reversal of 81708576 is 67580718.

It is a tau number, because it is divible by the number of its divisors (24).

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, 425470 + ... + 425661.

It is an arithmetic number, because the mean of its divisors is an integer number (8936886).

Almost surely, 2^81708576 is an apocalyptic number.

It is an amenable number.

81708576 is an abundant number, since it is smaller than the sum of its proper divisors (132776688).

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

81708576 is a wasteful number, since it uses less digits than its factorization.

81708576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851144 (or 851136 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 81708576 is about 9039.2796173146. The cubic root of 81708576 is about 433.9328684913.

The spelling of 81708576 in words is "eighty-one million, seven hundred eight thousand, five hundred seventy-six".