820445750 has 16 divisors (see below), whose sum is σ = 1535874912. Its totient is φ = 328178200.

The previous prime is 820445737. The next prime is 820445797. The reversal of 820445750 is 57544028.

It is a self number, because there is not a number n which added to its sum of digits gives 820445750.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1640642 + ... + 1641141.

It is an arithmetic number, because the mean of its divisors is an integer number (95992182).

Almost surely, 2^820445750 is an apocalyptic number.

820445750 is a deficient number, since it is larger than the sum of its proper divisors (715429162).

820445750 is a wasteful number, since it uses less digits than its factorization.

820445750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281800 (or 3281790 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 820445750 is about 28643.4242017256. The cubic root of 820445750 is about 936.1597322483.

Adding to 820445750 its reverse (57544028), we get a palindrome (877989778).

The spelling of 820445750 in words is "eight hundred twenty million, four hundred forty-five thousand, seven hundred fifty".