91628939544 has 64 divisors (see below), whose sum is σ = 234729260640. Its totient is φ = 29789168640.

The previous prime is 91628939539. The next prime is 91628939561. The reversal of 91628939544 is 44593982619.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3842442 + ... + 3866214.

Almost surely, 2^91628939544 is an apocalyptic number.

It is an amenable number.

91628939544 is an abundant number, since it is smaller than the sum of its proper divisors (143100321096).

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

91628939544 is a wasteful number, since it uses less digits than its factorization.

91628939544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27740 (or 27736 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 60.

The spelling of 91628939544 in words is "ninety-one billion, six hundred twenty-eight million, nine hundred thirty-nine thousand, five hundred forty-four".