91388092320 has 384 divisors, whose sum is σ = 367899840000. Its totient is φ = 20754579456.

The previous prime is 91388092277. The next prime is 91388092361. The reversal of 91388092320 is 2329088319.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4738056 + ... + 4757304.

It is an arithmetic number, because the mean of its divisors is an integer number (958072500).

Almost surely, 2^91388092320 is an apocalyptic number.

91388092320 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 91388092320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183949920000).

91388092320 is an abundant number, since it is smaller than the sum of its proper divisors (276511747680).

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

91388092320 is a wasteful number, since it uses less digits than its factorization.

91388092320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19437 (or 19423 counting only the distinct ones).

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

The spelling of 91388092320 in words is "ninety-one billion, three hundred eighty-eight million, ninety-two thousand, three hundred twenty".