820805425748 has 48 divisors (see below), whose sum is σ = 1808235147264. Its totient is φ = 316689510240.

The previous prime is 820805425747. The next prime is 820805425777. The reversal of 820805425748 is 847524508028.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 820805425748.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820805425747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12904940 + ... + 12968387.

It is an arithmetic number, because the mean of its divisors is an integer number (37671565568).

Almost surely, 2^820805425748 is an apocalyptic number.

It is an amenable number.

820805425748 is an abundant number, since it is smaller than the sum of its proper divisors (987429721516).

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

820805425748 is a wasteful number, since it uses less digits than its factorization.

820805425748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25873452 (or 25873450 counting only the distinct ones).

The product of its (nonzero) digits is 5734400, while the sum is 53.

The spelling of 820805425748 in words is "eight hundred twenty billion, eight hundred five million, four hundred twenty-five thousand, seven hundred forty-eight".