91939320 has 256 divisors, whose sum is σ = 342144000. Its totient is φ = 21772800.

The previous prime is 91939319. The next prime is 91939321. The reversal of 91939320 is 2393919.

It is an interprime number because it is at equal distance from previous prime (91939319) and next prime (91939321).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 843426 + ... + 843534.

It is an arithmetic number, because the mean of its divisors is an integer number (1336500).

Almost surely, 2^91939320 is an apocalyptic number.

91939320 is a gapful number since it is divisible by the number (90) 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 91939320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171072000).

91939320 is an abundant number, since it is smaller than the sum of its proper divisors (250204680).

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

91939320 is a wasteful number, since it uses less digits than its factorization.

91939320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 91939320 is about 9588.4993612139. The cubic root of 91939320 is about 451.3364712806.

The spelling of 91939320 in words is "ninety-one million, nine hundred thirty-nine thousand, three hundred twenty".