820899546 has 8 divisors (see below), whose sum is σ = 1641799104. Its totient is φ = 273633180.

The previous prime is 820899539. The next prime is 820899637. The reversal of 820899546 is 645998028.

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

820899546 is an admirable number.

It is a super-2 number, since 2×820899546² = 1347752129246012232, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 68408290 + ... + 68408301.

It is an arithmetic number, because the mean of its divisors is an integer number (205224888).

Almost surely, 2^820899546 is an apocalyptic number.

820899546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

820899546 is a wasteful number, since it uses less digits than its factorization.

820899546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136816596.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 820899546 is about 28651.3445757786. The cubic root of 820899546 is about 936.3322999210.

The spelling of 820899546 in words is "eight hundred twenty million, eight hundred ninety-nine thousand, five hundred forty-six".