1978614783320 has 128 divisors (see below), whose sum is σ = 5108313047040. Its totient is φ = 675661063680.

The previous prime is 1978614783319. The next prime is 1978614783349. The reversal of 1978614783320 is 233874168791.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978614783320.

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, 78594335 + ... + 78619505.

It is an arithmetic number, because the mean of its divisors is an integer number (39908695680).

Almost surely, 2^{1978614783320} is an apocalyptic number.

1978614783320 is a gapful number since it is divisible by the number (10) 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 1978614783320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2554156523520).

1978614783320 is an abundant number, since it is smaller than the sum of its proper divisors (3129698263720).

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

1978614783320 is a wasteful number, since it uses less digits than its factorization.

1978614783320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26305 (or 26301 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 1978614783320 in words is "one trillion, nine hundred seventy-eight billion, six hundred fourteen million, seven hundred eighty-three thousand, three hundred twenty".