91178680320 has 1200 divisors, whose sum is σ = 404981246208. Its totient is φ = 19110297600.

The previous prime is 91178680303. The next prime is 91178680393. The reversal of 91178680320 is 2308687119.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 603832245 + ... + 603832395.

Almost surely, 2^91178680320 is an apocalyptic number.

91178680320 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 91178680320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202490623104).

91178680320 is an abundant number, since it is smaller than the sum of its proper divisors (313802565888).

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

91178680320 is a wasteful number, since it uses less digits than its factorization.

91178680320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 91178680320 in words is "ninety-one billion, one hundred seventy-eight million, six hundred eighty thousand, three hundred twenty".