820825345 has 4 divisors (see below), whose sum is σ = 984990420. Its totient is φ = 656660272.

The previous prime is 820825337. The next prime is 820825387. The reversal of 820825345 is 543528028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467986689 + 352838656 = 21633^2 + 18784^2 .

It is a cyclic number.

It is not a de Polignac number, because 820825345 - 2³ = 820825337 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 82082530 + ... + 82082539.

It is an arithmetic number, because the mean of its divisors is an integer number (246247605).

Almost surely, 2^820825345 is an apocalyptic number.

It is an amenable number.

820825345 is a deficient number, since it is larger than the sum of its proper divisors (164165075).

820825345 is a wasteful number, since it uses less digits than its factorization.

820825345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164165074.

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 820825345 is about 28650.0496509168. The cubic root of 820825345 is about 936.3040874206.

The spelling of 820825345 in words is "eight hundred twenty million, eight hundred twenty-five thousand, three hundred forty-five".