91278450432 has 216 divisors, whose sum is σ = 284295209744. Its totient is φ = 27999240192.

The previous prime is 91278450407. The next prime is 91278450451. The reversal of 91278450432 is 23405487219.

91278450432 is a `hidden beast` number, since 91 + 2 + 7 + 84 + 50 + 432 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10089303 + ... + 10098345.

Almost surely, 2^91278450432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91278450432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142147604872).

91278450432 is an abundant number, since it is smaller than the sum of its proper divisors (193016759312).

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

91278450432 is a wasteful number, since it uses less digits than its factorization.

91278450432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9415 (or 9398 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 91278450432 in words is "ninety-one billion, two hundred seventy-eight million, four hundred fifty thousand, four hundred thirty-two".