91750020 has 96 divisors (see below), whose sum is σ = 273829248. Its totient is φ = 22874112.

The previous prime is 91750019. The next prime is 91750033. The reversal of 91750020 is 2005719.

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 31 ways as a sum of consecutive naturals, for example, 298707 + ... + 299013.

It is an arithmetic number, because the mean of its divisors is an integer number (2852388).

Almost surely, 2^91750020 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 91750020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136914624).

91750020 is an abundant number, since it is smaller than the sum of its proper divisors (182079228).

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

91750020 is a wasteful number, since it uses less digits than its factorization.

91750020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 91750020 is about 9578.6230743255. The cubic root of 91750020 is about 451.0264961826.

Adding to 91750020 its reverse (2005719), we get a palindrome (93755739).

The spelling of 91750020 in words is "ninety-one million, seven hundred fifty thousand, twenty".