91789958958 has 32 divisors (see below), whose sum is σ = 189650045952. Its totient is φ = 29586508800.

The previous prime is 91789958951. The next prime is 91789958977. The reversal of 91789958958 is 85985998719.

It is a super-2 number, since 2×91789958958² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91789958951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46318 + ... + 430958.

It is an arithmetic number, because the mean of its divisors is an integer number (5926563936).

Almost surely, 2^91789958958 is an apocalyptic number.

91789958958 is an abundant number, since it is smaller than the sum of its proper divisors (97860086994).

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

91789958958 is a wasteful number, since it uses less digits than its factorization.

91789958958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385960.

The product of its digits is 587865600, while the sum is 78.

The spelling of 91789958958 in words is "ninety-one billion, seven hundred eighty-nine million, nine hundred fifty-eight thousand, nine hundred fifty-eight".