780545556 has 144 divisors (see below), whose sum is σ = 2353827840. Its totient is φ = 213627456.

The previous prime is 780545551. The next prime is 780545561. The reversal of 780545556 is 655545087.

It is an interprime number because it is at equal distance from previous prime (780545551) and next prime (780545561).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780545551) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 6145965 + ... + 6146091.

Almost surely, 2^780545556 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 780545556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176913920).

780545556 is an abundant number, since it is smaller than the sum of its proper divisors (1573282284).

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

780545556 is a wasteful number, since it uses less digits than its factorization.

780545556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The square root of 780545556 is about 27938.2453994520. The cubic root of 780545556 is about 920.7309707353.

It can be divided in two parts, 7805 and 45556, that added together give a square (53361 = 231²).

The spelling of 780545556 in words is "seven hundred eighty million, five hundred forty-five thousand, five hundred fifty-six".