91912211628 has 48 divisors (see below), whose sum is σ = 227686203360. Its totient is φ = 28757873664.

The previous prime is 91912211623. The next prime is 91912211641. The reversal of 91912211628 is 82611221919.

It is a self number, because there is not a number n which added to its sum of digits gives 91912211628.

It is not an unprimeable number, because it can be changed into a prime (91912211623) 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, 527863 + ... + 680046.

It is an arithmetic number, because the mean of its divisors is an integer number (4743462570).

Almost surely, 2^91912211628 is an apocalyptic number.

It is an amenable number.

91912211628 is an abundant number, since it is smaller than the sum of its proper divisors (135773991732).

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

91912211628 is a wasteful number, since it uses less digits than its factorization.

91912211628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208306 (or 1208304 counting only the distinct ones).

The product of its digits is 31104, while the sum is 42.

The spelling of 91912211628 in words is "ninety-one billion, nine hundred twelve million, two hundred eleven thousand, six hundred twenty-eight".