780599664 has 120 divisors (see below), whose sum is σ = 2360161440. Its totient is φ = 239417856.

The previous prime is 780599657. The next prime is 780599689. The reversal of 780599664 is 466995087.

It is a self number, because there is not a number n which added to its sum of digits gives 780599664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 941202 + ... + 942030.

It is an arithmetic number, because the mean of its divisors is an integer number (19668012).

Almost surely, 2^780599664 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 780599664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1180080720).

780599664 is an abundant number, since it is smaller than the sum of its proper divisors (1579561776).

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

780599664 is a wasteful number, since it uses less digits than its factorization.

780599664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 780599664 is about 27939.2137326733. The cubic root of 780599664 is about 920.7522454962.

The spelling of 780599664 in words is "seven hundred eighty million, five hundred ninety-nine thousand, six hundred sixty-four".