91603668 has 48 divisors (see below), whose sum is σ = 232459136. Its totient is φ = 27907200.

The previous prime is 91603657. The next prime is 91603669. The reversal of 91603668 is 86630619.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91603669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13218 + ... + 18918.

Almost surely, 2^91603668 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 91603668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116229568).

91603668 is an abundant number, since it is smaller than the sum of its proper divisors (140855468).

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

91603668 is a wasteful number, since it uses less digits than its factorization.

91603668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5824 (or 5822 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 91603668 is about 9570.9805140330. The cubic root of 91603668 is about 450.7865552428.

The spelling of 91603668 in words is "ninety-one million, six hundred three thousand, six hundred sixty-eight".