780017868 has 324 divisors, whose sum is σ = 2627319240. Its totient is φ = 193342464.

The previous prime is 780017839. The next prime is 780017879. The reversal of 780017868 is 868710087.

780017868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 21081546 + ... + 21081582.

It is an arithmetic number, because the mean of its divisors is an integer number (8109010).

Almost surely, 2^780017868 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 780017868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313659620).

780017868 is an abundant number, since it is smaller than the sum of its proper divisors (1847301372).

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

780017868 is a wasteful number, since it uses less digits than its factorization.

780017868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 780017868 is about 27928.7999742202. The cubic root of 780017868 is about 920.5234371668.

The spelling of 780017868 in words is "seven hundred eighty million, seventeen thousand, eight hundred sixty-eight".