91212480000 has 1400 divisors, whose sum is σ = 377251153488. Its totient is φ = 21897216000.

The previous prime is 91212479951. The next prime is 91212480011. The reversal of 91212480000 is 8421219.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 139 ways as a sum of consecutive naturals, for example, 3965759989 + ... + 3965760011.

Almost surely, 2^91212480000 is an apocalyptic number.

91212480000 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 91212480000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188625576744).

91212480000 is an abundant number, since it is smaller than the sum of its proper divisors (286038673488).

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

91212480000 is an frugal number, since it uses more digits than its factorization.

91212480000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 91212480000 in words is "ninety-one billion, two hundred twelve million, four hundred eighty thousand".