91397504 has 64 divisors (see below), whose sum is σ = 200491200. Its totient is φ = 41157120.

The previous prime is 91397503. The next prime is 91397513. The reversal of 91397504 is 40579319.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91397503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195479 + ... + 195945.

It is an arithmetic number, because the mean of its divisors is an integer number (3132675).

Almost surely, 2^91397504 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 91397504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100245600).

91397504 is an abundant number, since it is smaller than the sum of its proper divisors (109093696).

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

91397504 is a wasteful number, since it uses less digits than its factorization.

91397504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 91397504 is about 9560.2041819200. The cubic root of 91397504 is about 450.4481198594.

The spelling of 91397504 in words is "ninety-one million, three hundred ninety-seven thousand, five hundred four".