91543920 has 240 divisors, whose sum is σ = 320774112. Its totient is φ = 21565440.

The previous prime is 91543877. The next prime is 91543927. The reversal of 91543920 is 2934519.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91543927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1500690 + ... + 1500750.

Almost surely, 2^91543920 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 91543920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160387056).

91543920 is an abundant number, since it is smaller than the sum of its proper divisors (229230192).

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

91543920 is a wasteful number, since it uses less digits than its factorization.

91543920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 91543920 is about 9567.8586946087. The cubic root of 91543920 is about 450.6885262244.

The spelling of 91543920 in words is "ninety-one million, five hundred forty-three thousand, nine hundred twenty".