91445564 has 36 divisors (see below), whose sum is σ = 189690984. Its totient is φ = 38447136.

The previous prime is 91445561. The next prime is 91445569. The reversal of 91445564 is 46554419.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91445561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5987 + ... + 14789.

It is an arithmetic number, because the mean of its divisors is an integer number (5269194).

Almost surely, 2^91445564 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 91445564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94845492).

91445564 is an abundant number, since it is smaller than the sum of its proper divisors (98245420).

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

91445564 is a wasteful number, since it uses less digits than its factorization.

91445564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8874 (or 8865 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 91445564 is about 9562.7173962216. The cubic root of 91445564 is about 450.5270598096.

The spelling of 91445564 in words is "ninety-one million, four hundred forty-five thousand, five hundred sixty-four".