780646464 has 448 divisors, whose sum is σ = 2731008000. Its totient is φ = 216483840.

The previous prime is 780646459. The next prime is 780646507. The reversal of 780646464 is 464646087.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13231267 + ... + 13231325.

It is an arithmetic number, because the mean of its divisors is an integer number (6096000).

Almost surely, 2^780646464 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 780646464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365504000).

780646464 is an abundant number, since it is smaller than the sum of its proper divisors (1950361536).

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

780646464 is a wasteful number, since it uses less digits than its factorization.

780646464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The square root of 780646464 is about 27940.0512526373. The cubic root of 780646464 is about 920.7706460268.

The spelling of 780646464 in words is "seven hundred eighty million, six hundred forty-six thousand, four hundred sixty-four".