778840412616 has 320 divisors, whose sum is σ = 2647587254400. Its totient is φ = 208945723392.

The previous prime is 778840412569. The next prime is 778840412621. The reversal of 778840412616 is 616214048877.

778840412616 is a `hidden beast` number, since 7 + 7 + 8 + 8 + 4 + 0 + 4 + 12 + 616 = 666.

It is a super-2 number, since 2×778840412616² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9698806 + ... + 9778778.

It is an arithmetic number, because the mean of its divisors is an integer number (8273710170).

Almost surely, 2^778840412616 is an apocalyptic number.

778840412616 is a gapful number since it is divisible by the number (76) 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 778840412616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323793627200).

778840412616 is an abundant number, since it is smaller than the sum of its proper divisors (1868746841784).

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

778840412616 is a wasteful number, since it uses less digits than its factorization.

778840412616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80130 (or 80117 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 778840412616 in words is "seven hundred seventy-eight billion, eight hundred forty million, four hundred twelve thousand, six hundred sixteen".