778288121340 has 48 divisors (see below), whose sum is σ = 2179562058240. Its totient is φ = 207509659200.

The previous prime is 778288121327. The next prime is 778288121341. The reversal of 778288121340 is 43121882877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778288121341) 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, 685360 + ... + 1423479.

It is an arithmetic number, because the mean of its divisors is an integer number (45407542880).

Almost surely, 2^778288121340 is an apocalyptic number.

It is an amenable number.

778288121340 is an abundant number, since it is smaller than the sum of its proper divisors (1401273936900).

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

778288121340 is a wasteful number, since it uses less digits than its factorization.

778288121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115002 (or 2115000 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 51.

The spelling of 778288121340 in words is "seven hundred seventy-eight billion, two hundred eighty-eight million, one hundred twenty-one thousand, three hundred forty".