91573944 has 96 divisors (see below), whose sum is σ = 290563200. Its totient is φ = 23782080.

The previous prime is 91573943. The next prime is 91573987. The reversal of 91573944 is 44937519.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 91573896 and 91573905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91573943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9397 + ... + 16475.

It is an arithmetic number, because the mean of its divisors is an integer number (3026700).

Almost surely, 2^91573944 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 91573944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145281600).

91573944 is an abundant number, since it is smaller than the sum of its proper divisors (198989256).

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

91573944 is a wasteful number, since it uses less digits than its factorization.

91573944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7113 (or 7102 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 91573944 is about 9569.4275690869. The cubic root of 91573944 is about 450.7377921696.

The spelling of 91573944 in words is "ninety-one million, five hundred seventy-three thousand, nine hundred forty-four".