91889628 has 24 divisors (see below), whose sum is σ = 214572288. Its totient is φ = 30606576.

The previous prime is 91889617. The next prime is 91889647. The reversal of 91889628 is 82698819.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 22125 + ... + 25947.

It is an arithmetic number, because the mean of its divisors is an integer number (8940512).

Almost surely, 2^91889628 is an apocalyptic number.

It is an amenable number.

91889628 is an abundant number, since it is smaller than the sum of its proper divisors (122682660).

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

91889628 is a wasteful number, since it uses less digits than its factorization.

91889628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833 (or 5831 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 91889628 is about 9585.9077817388. The cubic root of 91889628 is about 451.2551428066.

The spelling of 91889628 in words is "ninety-one million, eight hundred eighty-nine thousand, six hundred twenty-eight".