81706760928590 has 96 divisors (see below), whose sum is σ = 174003785419968. Its totient is φ = 27536253696000.

The previous prime is 81706760928563. The next prime is 81706760928601. The reversal of 81706760928590 is 9582906760718.

It is a happy number.

It is a super-2 number, since 2×81706760928590² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81706760928590.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44259230 + ... + 46068350.

It is an arithmetic number, because the mean of its divisors is an integer number (1812539431458).

Almost surely, 2^{81706760928590} is an apocalyptic number.

81706760928590 is an abundant number, since it is smaller than the sum of its proper divisors (92297024491378).

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

81706760928590 is a wasteful number, since it uses less digits than its factorization.

81706760928590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810714 (or 1810707 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 68.

The spelling of 81706760928590 in words is "eighty-one trillion, seven hundred six billion, seven hundred sixty million, nine hundred twenty-eight thousand, five hundred ninety".