780358644 has 96 divisors (see below), whose sum is σ = 2220099840. Its totient is φ = 235557504.

The previous prime is 780358643. The next prime is 780358669. The reversal of 780358644 is 446853087.

It is a super-2 number, since 2×780358644² = 1217919226531037472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 780358644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780358643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69169 + ... + 79655.

It is an arithmetic number, because the mean of its divisors is an integer number (23126040).

Almost surely, 2^780358644 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 780358644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1110049920).

780358644 is an abundant number, since it is smaller than the sum of its proper divisors (1439741196).

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

780358644 is a wasteful number, since it uses less digits than its factorization.

780358644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10566 (or 10558 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 780358644 is about 27934.9001072136. The cubic root of 780358644 is about 920.6574711151.

The spelling of 780358644 in words is "seven hundred eighty million, three hundred fifty-eight thousand, six hundred forty-four".