91201440 has 192 divisors, whose sum is σ = 327462912. Its totient is φ = 21120000.

The previous prime is 91201421. The next prime is 91201469. The reversal of 91201440 is 4410219.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121065 + ... + 121815.

It is an arithmetic number, because the mean of its divisors is an integer number (1705536).

Almost surely, 2^91201440 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 91201440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163731456).

91201440 is an abundant number, since it is smaller than the sum of its proper divisors (236261472).

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

91201440 is a wasteful number, since it uses less digits than its factorization.

91201440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 91201440 is about 9549.9445024565. The cubic root of 91201440 is about 450.1257919936.

Adding to 91201440 its reverse (4410219), we get a palindrome (95611659).

The spelling of 91201440 in words is "ninety-one million, two hundred one thousand, four hundred forty".