780765216 has 288 divisors, whose sum is σ = 2647572480. Its totient is φ = 199180800.

The previous prime is 780765187. The next prime is 780765221. The reversal of 780765216 is 612567087.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4087681 + ... + 4087871.

It is an arithmetic number, because the mean of its divisors is an integer number (9192960).

Almost surely, 2^780765216 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 780765216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323786240).

780765216 is an abundant number, since it is smaller than the sum of its proper divisors (1866807264).

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

780765216 is a wasteful number, since it uses less digits than its factorization.

780765216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 780765216 is about 27942.1762931952. The cubic root of 780765216 is about 920.8173328933.

The spelling of 780765216 in words is "seven hundred eighty million, seven hundred sixty-five thousand, two hundred sixteen".