978188903808 has 128 divisors (see below), whose sum is σ = 2682881879040. Its totient is φ = 315456460800.

The previous prime is 978188903803. The next prime is 978188903821. The reversal of 978188903808 is 808309881879.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978188903803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52618291 + ... + 52636877.

It is an arithmetic number, because the mean of its divisors is an integer number (20960014680).

Almost surely, 2^978188903808 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 978188903808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341440939520).

978188903808 is an abundant number, since it is smaller than the sum of its proper divisors (1704692975232).

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

978188903808 is a wasteful number, since it uses less digits than its factorization.

978188903808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23056 (or 23044 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 69.

The spelling of 978188903808 in words is "nine hundred seventy-eight billion, one hundred eighty-eight million, nine hundred three thousand, eight hundred eight".