820857850 has 24 divisors (see below), whose sum is σ = 1532901888. Its totient is φ = 327030000.

The previous prime is 820857811. The next prime is 820857853. The reversal of 820857850 is 58758028.

It is a junction number, because it is equal to n+sod(n) for n = 820857797 and 820857806.

It is not an unprimeable number, because it can be changed into a prime (820857853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20154 + ... + 45253.

It is an arithmetic number, because the mean of its divisors is an integer number (63870912).

Almost surely, 2^820857850 is an apocalyptic number.

820857850 is a deficient number, since it is larger than the sum of its proper divisors (712044038).

820857850 is a wasteful number, since it uses less digits than its factorization.

820857850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65670 (or 65665 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 43.

The square root of 820857850 is about 28650.6169218047. The cubic root of 820857850 is about 936.3164465917.

The spelling of 820857850 in words is "eight hundred twenty million, eight hundred fifty-seven thousand, eight hundred fifty".