91573398 has 48 divisors (see below), whose sum is σ = 228118176. Its totient is φ = 26006400.

The previous prime is 91573379. The next prime is 91573399. The reversal of 91573398 is 89337519.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91573399) 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, 19698 + ... + 23898.

It is an arithmetic number, because the mean of its divisors is an integer number (4752462).

Almost surely, 2^91573398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91573398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114059088).

91573398 is an abundant number, since it is smaller than the sum of its proper divisors (136544778).

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

91573398 is a wasteful number, since it uses less digits than its factorization.

91573398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389 (or 4386 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 91573398 is about 9569.3990406922. The cubic root of 91573398 is about 450.7368963423.

The spelling of 91573398 in words is "ninety-one million, five hundred seventy-three thousand, three hundred ninety-eight".