820954825780 has 24 divisors (see below), whose sum is σ = 1825417201608. Its totient is φ = 309065346048.

The previous prime is 820954825727. The next prime is 820954825781. The reversal of 820954825780 is 87528459028.

It can be written as a sum of positive squares in 4 ways, for example, as 150043121316 + 670911704464 = 387354^2 + 819092^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820954825781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1207286169 + ... + 1207286848.

It is an arithmetic number, because the mean of its divisors is an integer number (76059050067).

Almost surely, 2^820954825780 is an apocalyptic number.

It is an amenable number.

820954825780 is an abundant number, since it is smaller than the sum of its proper divisors (1004462375828).

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

820954825780 is a wasteful number, since it uses less digits than its factorization.

820954825780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414573043 (or 2414573041 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 58.

It can be divided in two parts, 8209548 and 25780, that added together give a palindrome (8235328).

The spelling of 820954825780 in words is "eight hundred twenty billion, nine hundred fifty-four million, eight hundred twenty-five thousand, seven hundred eighty".