817147844980 has 24 divisors (see below), whose sum is σ = 1731753694440. Its totient is φ = 323860429440.

The previous prime is 817147844959. The next prime is 817147845047. The reversal of 817147844980 is 89448741718.

It can be written as a sum of positive squares in 4 ways, for example, as 179686123236 + 637461721744 = 423894^2 + 798412^2 .

It is a super-2 number, since 2×817147844980² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

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, 187417051 + ... + 187421410.

It is an arithmetic number, because the mean of its divisors is an integer number (72156403935).

Almost surely, 2^817147844980 is an apocalyptic number.

It is an amenable number.

817147844980 is an abundant number, since it is smaller than the sum of its proper divisors (914605849460).

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

817147844980 is a wasteful number, since it uses less digits than its factorization.

817147844980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374838579 (or 374838577 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 61.

The spelling of 817147844980 in words is "eight hundred seventeen billion, one hundred forty-seven million, eight hundred forty-four thousand, nine hundred eighty".