820899545 has 8 divisors (see below), whose sum is σ = 985287240. Its totient is φ = 656581120.

The previous prime is 820899539. The next prime is 820899637. The reversal of 820899545 is 545998028.

It can be written as a sum of positive squares in 4 ways, for example, as 162001984 + 658897561 = 12728^2 + 25669^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 820899545 - 2⁶ = 820899481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 820899493 and 820899502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13865 + ... + 42825.

It is an arithmetic number, because the mean of its divisors is an integer number (123160905).

Almost surely, 2^820899545 is an apocalyptic number.

It is an amenable number.

820899545 is a deficient number, since it is larger than the sum of its proper divisors (164387695).

820899545 is a wasteful number, since it uses less digits than its factorization.

820899545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34635.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 820899545 is about 28651.3445583275. The cubic root of 820899545 is about 936.3322995408.

The spelling of 820899545 in words is "eight hundred twenty million, eight hundred ninety-nine thousand, five hundred forty-five".