81708762 has 16 divisors (see below), whose sum is σ = 163516320. Its totient is φ = 27219792.

The previous prime is 81708743. The next prime is 81708763. The reversal of 81708762 is 26780718.

It is a self number, because there is not a number n which added to its sum of digits gives 81708762.

It is not an unprimeable number, because it can be changed into a prime (81708763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10789 + ... + 16727.

It is an arithmetic number, because the mean of its divisors is an integer number (10219770).

Almost surely, 2^81708762 is an apocalyptic number.

81708762 is an abundant number, since it is smaller than the sum of its proper divisors (81807558).

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

81708762 is a wasteful number, since it uses less digits than its factorization.

81708762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8237.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 81708762 is about 9039.2899057393. The cubic root of 81708762 is about 433.9331977569.

The spelling of 81708762 in words is "eighty-one million, seven hundred eight thousand, seven hundred sixty-two".