7780921344 has 624 divisors, whose sum is σ = 28989587200. Its totient is φ = 2014543872.

The previous prime is 7780921339. The next prime is 7780921373. The reversal of 7780921344 is 4431290877.

It is a self number, because there is not a number n which added to its sum of digits gives 7780921344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 338300917 + ... + 338300939.

Almost surely, 2^7780921344 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 7780921344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14494793600).

7780921344 is an abundant number, since it is smaller than the sum of its proper divisors (21208665856).

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

7780921344 is a wasteful number, since it uses less digits than its factorization.

7780921344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 7780921344 is about 88209.5309136150. The cubic root of 7780921344 is about 1981.5742118092.

The spelling of 7780921344 in words is "seven billion, seven hundred eighty million, nine hundred twenty-one thousand, three hundred forty-four".