91278213120 has 680 divisors, whose sum is σ = 346373467440. Its totient is φ = 22932357120.

The previous prime is 91278213119. The next prime is 91278213137. The reversal of 91278213120 is 2131287219.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 504299430 + ... + 504299610.

Almost surely, 2^91278213120 is an apocalyptic number.

91278213120 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 91278213120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173186733720).

91278213120 is an abundant number, since it is smaller than the sum of its proper divisors (255095254320).

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

91278213120 is an equidigital number, since it uses as much as digits as its factorization.

91278213120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 91278213120 in words is "ninety-one billion, two hundred seventy-eight million, two hundred thirteen thousand, one hundred twenty".