91978848 has 192 divisors, whose sum is σ = 304819200. Its totient is φ = 26749440.

The previous prime is 91978837. The next prime is 91978877. The reversal of 91978848 is 84887919.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 91978794 and 91978803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213193 + ... + 213623.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^91978848 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 91978848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152409600).

91978848 is an abundant number, since it is smaller than the sum of its proper divisors (212840352).

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

91978848 is a wasteful number, since it uses less digits than its factorization.

91978848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 468 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 91978848 is about 9590.5603590197. The cubic root of 91978848 is about 451.4011439071.

The spelling of 91978848 in words is "ninety-one million, nine hundred seventy-eight thousand, eight hundred forty-eight".