820670780 has 24 divisors (see below), whose sum is σ = 1742776560. Its totient is φ = 324579200.

The previous prime is 820670777. The next prime is 820670803. The reversal of 820670780 is 87076028.

820670780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228746 + ... + 232305.

It is an arithmetic number, because the mean of its divisors is an integer number (72615690).

Almost surely, 2^820670780 is an apocalyptic number.

It is an amenable number.

820670780 is an abundant number, since it is smaller than the sum of its proper divisors (922105780).

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

820670780 is a wasteful number, since it uses less digits than its factorization.

820670780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461149 (or 461147 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 820670780 is about 28647.3520591345. The cubic root of 820670780 is about 936.2453136807.

The spelling of 820670780 in words is "eight hundred twenty million, six hundred seventy thousand, seven hundred eighty".