820123749780 has 48 divisors (see below), whose sum is σ = 2296387814784. Its totient is φ = 218695731840.

The previous prime is 820123749779. The next prime is 820123749793. The reversal of 820123749780 is 87947321028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5011734 + ... + 5172786.

It is an arithmetic number, because the mean of its divisors is an integer number (47841412808).

Almost surely, 2^820123749780 is an apocalyptic number.

It is an amenable number.

820123749780 is an abundant number, since it is smaller than the sum of its proper divisors (1476264065004).

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

820123749780 is a wasteful number, since it uses less digits than its factorization.

820123749780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245936 (or 245934 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 820123749780 in words is "eight hundred twenty billion, one hundred twenty-three million, seven hundred forty-nine thousand, seven hundred eighty".