778921799040 has 1536 divisors, whose sum is σ = 3649145472000. Its totient is φ = 153280512000.

The previous prime is 778921799039. The next prime is 778921799041. The reversal of 778921799040 is 40997129877.

It is an interprime number because it is at equal distance from previous prime (778921799039) and next prime (778921799041).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778921799041) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 278085640 + ... + 278088440.

It is an arithmetic number, because the mean of its divisors is an integer number (2375745750).

Almost surely, 2^778921799040 is an apocalyptic number.

778921799040 is a gapful number since it is divisible by the number (70) 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 778921799040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824572736000).

778921799040 is an abundant number, since it is smaller than the sum of its proper divisors (2870223672960).

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

778921799040 is a wasteful number, since it uses less digits than its factorization.

778921799040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877 (or 2848 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 63.

The spelling of 778921799040 in words is "seven hundred seventy-eight billion, nine hundred twenty-one million, seven hundred ninety-nine thousand, forty".