817705390980 has 96 divisors (see below), whose sum is σ = 2391977226240. Its totient is φ = 208451084800.

The previous prime is 817705390933. The next prime is 817705391053. The reversal of 817705390980 is 89093507718.

It is a self number, because there is not a number n which added to its sum of digits gives 817705390980.

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 31 ways as a sum of consecutive naturals, for example, 2150724 + ... + 2502203.

It is an arithmetic number, because the mean of its divisors is an integer number (24916429440).

Almost surely, 2^817705390980 is an apocalyptic number.

It is an amenable number.

817705390980 is an abundant number, since it is smaller than the sum of its proper divisors (1574271835260).

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

817705390980 is a wasteful number, since it uses less digits than its factorization.

817705390980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4653069 (or 4653067 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 817705390980 in words is "eight hundred seventeen billion, seven hundred five million, three hundred ninety thousand, nine hundred eighty".