91544544 has 216 divisors, whose sum is σ = 326781000. Its totient is φ = 24095232.

The previous prime is 91544543. The next prime is 91544597. The reversal of 91544544 is 44544519.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91544499 and 91544508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91544543) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 183207 + ... + 183705.

It is an arithmetic number, because the mean of its divisors is an integer number (1512875).

Almost surely, 2^91544544 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 91544544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163390500).

91544544 is an abundant number, since it is smaller than the sum of its proper divisors (235236456).

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

91544544 is a wasteful number, since it uses less digits than its factorization.

91544544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 524 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 91544544 is about 9567.8913037304. The cubic root of 91544544 is about 450.6895502465.

The spelling of 91544544 in words is "ninety-one million, five hundred forty-four thousand, five hundred forty-four".