820783387028 has 12 divisors (see below), whose sum is σ = 1566950102592. Its totient is φ = 373083357720.

The previous prime is 820783387001. The next prime is 820783387031.

820783387028 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9327083900 + ... + 9327083987.

It is an arithmetic number, because the mean of its divisors is an integer number (130579175216).

Almost surely, 2^820783387028 is an apocalyptic number.

It is an amenable number.

820783387028 is a deficient number, since it is larger than the sum of its proper divisors (746166715564).

820783387028 is a wasteful number, since it uses less digits than its factorization.

820783387028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18654167902 (or 18654167900 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 56.

The spelling of 820783387028 in words is "eight hundred twenty billion, seven hundred eighty-three million, three hundred eighty-seven thousand, twenty-eight".