91560144 has 60 divisors (see below), whose sum is σ = 256147296. Its totient is φ = 28169856.

The previous prime is 91560137. The next prime is 91560173. The reversal of 91560144 is 44106519.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2469 + ... + 13755.

Almost surely, 2^91560144 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 91560144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128073648).

91560144 is an abundant number, since it is smaller than the sum of its proper divisors (164587152).

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

91560144 is a wasteful number, since it uses less digits than its factorization.

91560144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11324 (or 11305 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 91560144 is about 9568.7064956555. The cubic root of 91560144 is about 450.7151492877.

The spelling of 91560144 in words is "ninety-one million, five hundred sixty thousand, one hundred forty-four".