778667332032 has 112 divisors (see below), whose sum is σ = 2292646651680. Its totient is φ = 259157919744.

The previous prime is 778667332031. The next prime is 778667332049. The reversal of 778667332032 is 230233766877.

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

It is a self number, because there is not a number n which added to its sum of digits gives 778667332032.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778667332031) 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, 783348 + ... + 1473420.

It is an arithmetic number, because the mean of its divisors is an integer number (20470059390).

Almost surely, 2^778667332032 is an apocalyptic number.

778667332032 is a gapful number since it is divisible by the number (72) 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 778667332032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1146323325840).

778667332032 is an abundant number, since it is smaller than the sum of its proper divisors (1513979319648).

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

778667332032 is a wasteful number, since it uses less digits than its factorization.

778667332032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690747 (or 690731 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 54.

The spelling of 778667332032 in words is "seven hundred seventy-eight billion, six hundred sixty-seven million, three hundred thirty-two thousand, thirty-two".