91493388 has 216 divisors, whose sum is σ = 298024272. Its totient is φ = 24385536.

The previous prime is 91493383. The next prime is 91493399. The reversal of 91493388 is 88339419.

It is not an unprimeable number, because it can be changed into a prime (91493383) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 809620 + ... + 809732.

It is an arithmetic number, because the mean of its divisors is an integer number (1379742).

Almost surely, 2^91493388 is an apocalyptic number.

91493388 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91493388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149012136).

91493388 is an abundant number, since it is smaller than the sum of its proper divisors (206530884).

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

91493388 is a wasteful number, since it uses less digits than its factorization.

91493388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 142 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 91493388 is about 9565.2176138340. The cubic root of 91493388 is about 450.6055846727.

The spelling of 91493388 in words is "ninety-one million, four hundred ninety-three thousand, three hundred eighty-eight".