91812640268 has 12 divisors (see below), whose sum is σ = 160713271992. Its totient is φ = 45894562560.

The previous prime is 91812640267. The next prime is 91812640289. The reversal of 91812640268 is 86204621819.

It is a super-2 number, since 2×91812640268² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91812640267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2921813 + ... + 2953068.

It is an arithmetic number, because the mean of its divisors is an integer number (13392772666).

Almost surely, 2^91812640268 is an apocalyptic number.

It is an amenable number.

91812640268 is a deficient number, since it is larger than the sum of its proper divisors (68900631724).

91812640268 is a wasteful number, since it uses less digits than its factorization.

91812640268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5878792 (or 5878790 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 91812640268 in words is "ninety-one billion, eight hundred twelve million, six hundred forty thousand, two hundred sixty-eight".