91996878870 has 384 divisors, whose sum is σ = 283036291200. Its totient is φ = 21180137472.

The previous prime is 91996878863. The next prime is 91996878889. The reversal of 91996878870 is 7887869919.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 180740176 + ... + 180740684.

It is an arithmetic number, because the mean of its divisors is an integer number (737073675).

Almost surely, 2^91996878870 is an apocalyptic number.

91996878870 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91996878870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141518145600).

91996878870 is an abundant number, since it is smaller than the sum of its proper divisors (191039412330).

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

91996878870 is a wasteful number, since it uses less digits than its factorization.

91996878870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 72.

The spelling of 91996878870 in words is "ninety-one billion, nine hundred ninety-six million, eight hundred seventy-eight thousand, eight hundred seventy".