91378042380 has 240 divisors, whose sum is σ = 290352142080. Its totient is φ = 24054890112.

The previous prime is 91378042373. The next prime is 91378042409. The reversal of 91378042380 is 8324087319.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 69913687 + ... + 69914993.

It is an arithmetic number, because the mean of its divisors is an integer number (1209800592).

Almost surely, 2^91378042380 is an apocalyptic number.

91378042380 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 91378042380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145176071040).

91378042380 is an abundant number, since it is smaller than the sum of its proper divisors (198974099700).

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

91378042380 is a wasteful number, since it uses less digits than its factorization.

91378042380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 1839 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 91378042380 in words is "ninety-one billion, three hundred seventy-eight million, forty-two thousand, three hundred eighty".