91440168730 has 32 divisors (see below), whose sum is σ = 171793125504. Its totient is φ = 34976711616.

The previous prime is 91440168727. The next prime is 91440168731. The reversal of 91440168730 is 3786104419.

It is a super-2 number, since 2×91440168730² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91440168731) 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 15 ways as a sum of consecutive naturals, for example, 871032 + ... + 970348.

It is an arithmetic number, because the mean of its divisors is an integer number (5368535172).

Almost surely, 2^91440168730 is an apocalyptic number.

91440168730 is a deficient number, since it is larger than the sum of its proper divisors (80352956774).

91440168730 is a wasteful number, since it uses less digits than its factorization.

91440168730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103350.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 91440168730 in words is "ninety-one billion, four hundred forty million, one hundred sixty-eight thousand, seven hundred thirty".