978640984992 has 384 divisors, whose sum is σ = 2923672485888. Its totient is φ = 283956019200.

The previous prime is 978640984991. The next prime is 978640985033. The reversal of 978640984992 is 299489046879.

It is a super-2 number, since 2×978640984992² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (978640984991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1696084608 + ... + 1696085184.

It is an arithmetic number, because the mean of its divisors is an integer number (7613730432).

Almost surely, 2^978640984992 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 978640984992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1461836242944).

978640984992 is an abundant number, since it is smaller than the sum of its proper divisors (1945031500896).

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

978640984992 is a wasteful number, since it uses less digits than its factorization.

978640984992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 564350976, while the sum is 75.

The spelling of 978640984992 in words is "nine hundred seventy-eight billion, six hundred forty million, nine hundred eighty-four thousand, nine hundred ninety-two".