91032144 has 80 divisors (see below), whose sum is σ = 284588928. Its totient is φ = 24477696.

The previous prime is 91032143. The next prime is 91032157. The reversal of 91032144 is 44123019.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91032143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2257 + ... + 13680.

Almost surely, 2^91032144 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 91032144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142294464).

91032144 is an abundant number, since it is smaller than the sum of its proper divisors (193556784).

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

91032144 is a wasteful number, since it uses less digits than its factorization.

91032144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15972 (or 15966 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 91032144 is about 9541.0766688042. The cubic root of 91032144 is about 449.8470986702.

The spelling of 91032144 in words is "ninety-one million, thirty-two thousand, one hundred forty-four".