817640526228 has 24 divisors (see below), whose sum is σ = 1917512305632. Its totient is φ = 271163354784.

The previous prime is 817640526217. The next prime is 817640526247. The reversal of 817640526228 is 822625046718.

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, 172933450 + ... + 172938177.

It is an arithmetic number, because the mean of its divisors is an integer number (79896346068).

Almost surely, 2^817640526228 is an apocalyptic number.

It is an amenable number.

817640526228 is an abundant number, since it is smaller than the sum of its proper divisors (1099871779404).

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

817640526228 is a wasteful number, since it uses less digits than its factorization.

817640526228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345871831 (or 345871829 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 817640526228 in words is "eight hundred seventeen billion, six hundred forty million, five hundred twenty-six thousand, two hundred twenty-eight".