780307728 has 40 divisors (see below), whose sum is σ = 2045889888. Its totient is φ = 256219392.

The previous prime is 780307721. The next prime is 780307753. The reversal of 780307728 is 827703087.

It is a self number, because there is not a number n which added to its sum of digits gives 780307728.

It is not an unprimeable number, because it can be changed into a prime (780307721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118101 + ... + 124532.

Almost surely, 2^780307728 is an apocalyptic number.

It is an amenable number.

780307728 is an abundant number, since it is smaller than the sum of its proper divisors (1265582160).

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

780307728 is a wasteful number, since it uses less digits than its factorization.

780307728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242711 (or 242705 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 780307728 is about 27933.9887592159. The cubic root of 780307728 is about 920.6374473240.

It can be divided in two parts, 78030 and 7728, that added together give a palindrome (85758).

The spelling of 780307728 in words is "seven hundred eighty million, three hundred seven thousand, seven hundred twenty-eight".