91276225920 has 1024 divisors, whose sum is σ = 381982003200. Its totient is φ = 20348928000.

The previous prime is 91276225889. The next prime is 91276225939. The reversal of 91276225920 is 2952267219.

91276225920 is a `hidden beast` number, since 9 + 12 + 7 + 622 + 5 + 9 + 2 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 151873620 + ... + 151874220.

It is an arithmetic number, because the mean of its divisors is an integer number (373029300).

Almost surely, 2^91276225920 is an apocalyptic number.

91276225920 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 91276225920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190991001600).

91276225920 is an abundant number, since it is smaller than the sum of its proper divisors (290705777280).

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

91276225920 is a wasteful number, since it uses less digits than its factorization.

91276225920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 91276225920 in words is "ninety-one billion, two hundred seventy-six million, two hundred twenty-five thousand, nine hundred twenty".