820699044 has 48 divisors (see below), whose sum is σ = 2094447936. Its totient is φ = 248054400.

The previous prime is 820699001. The next prime is 820699049. The reversal of 820699044 is 440996028.

It is a junction number, because it is equal to n+sod(n) for n = 820698987 and 820699005.

It is not an unprimeable number, because it can be changed into a prime (820699049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44574 + ... + 60234.

It is an arithmetic number, because the mean of its divisors is an integer number (43634332).

Almost surely, 2^820699044 is an apocalyptic number.

It is an amenable number.

820699044 is an abundant number, since it is smaller than the sum of its proper divisors (1273748892).

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

820699044 is a wasteful number, since it uses less digits than its factorization.

820699044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16076 (or 16074 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 820699044 is about 28647.8453640060. The cubic root of 820699044 is about 936.2560616909.

The spelling of 820699044 in words is "eight hundred twenty million, six hundred ninety-nine thousand, forty-four".