820723700636 has 24 divisors (see below), whose sum is σ = 1727839370880. Its totient is φ = 333226163952.

The previous prime is 820723700609. The next prime is 820723700651. The reversal of 820723700636 is 636007327028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771356330 + ... + 771357393.

It is an arithmetic number, because the mean of its divisors is an integer number (71993307120).

Almost surely, 2^820723700636 is an apocalyptic number.

It is an amenable number.

820723700636 is an abundant number, since it is smaller than the sum of its proper divisors (907115670244).

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

820723700636 is a wasteful number, since it uses less digits than its factorization.

820723700636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542713753 (or 1542713751 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 820723700636 in words is "eight hundred twenty billion, seven hundred twenty-three million, seven hundred thousand, six hundred thirty-six".