978643340 has 72 divisors (see below), whose sum is σ = 2182223232. Its totient is φ = 368271360.

The previous prime is 978643297. The next prime is 978643373. The reversal of 978643340 is 43346879.

It is a happy number.

978643340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 978643291 and 978643300.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 848204 + ... + 849356.

It is an arithmetic number, because the mean of its divisors is an integer number (30308656).

Almost surely, 2^978643340 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 978643340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091111616).

978643340 is an abundant number, since it is smaller than the sum of its proper divisors (1203579892).

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

978643340 is a wasteful number, since it uses less digits than its factorization.

978643340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 978643340 is about 31283.2757236195. The cubic root of 978643340 is about 992.8298247972.

The spelling of 978643340 in words is "nine hundred seventy-eight million, six hundred forty-three thousand, three hundred forty".