91747921740 has 24 divisors (see below), whose sum is σ = 256894181040. Its totient is φ = 24466112448.

The previous prime is 91747921703. The next prime is 91747921849. The reversal of 91747921740 is 4712974719.

It is a super-2 number, since 2×91747921740² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764565955 + ... + 764566074.

It is an arithmetic number, because the mean of its divisors is an integer number (10703924210).

Almost surely, 2^91747921740 is an apocalyptic number.

It is an amenable number.

91747921740 is an abundant number, since it is smaller than the sum of its proper divisors (165146259300).

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

91747921740 is a wasteful number, since it uses less digits than its factorization.

91747921740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529132041 (or 1529132039 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 51.

The spelling of 91747921740 in words is "ninety-one billion, seven hundred forty-seven million, nine hundred twenty-one thousand, seven hundred forty".