91810628 has 48 divisors (see below), whose sum is σ = 201519360. Its totient is φ = 35627904.

The previous prime is 91810627. The next prime is 91810639. The reversal of 91810628 is 82601819.

It is not an unprimeable number, because it can be changed into a prime (91810627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16913 + ... + 21671.

It is an arithmetic number, because the mean of its divisors is an integer number (4198320).

Almost surely, 2^91810628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91810628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100759680).

91810628 is an abundant number, since it is smaller than the sum of its proper divisors (109708732).

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

91810628 is a wasteful number, since it uses less digits than its factorization.

91810628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836 (or 4834 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 91810628 is about 9581.7862635315. The cubic root of 91810628 is about 451.1257869764.

The spelling of 91810628 in words is "ninety-one million, eight hundred ten thousand, six hundred twenty-eight".