817216920528 has 40 divisors (see below), whose sum is σ = 2140063497408. Its totient is φ = 268674054912.

The previous prime is 817216920449. The next prime is 817216920643. The reversal of 817216920528 is 825029612718.

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, 116608500 + ... + 116615507.

Almost surely, 2^817216920528 is an apocalyptic number.

It is an amenable number.

817216920528 is an abundant number, since it is smaller than the sum of its proper divisors (1322846576880).

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

817216920528 is a wasteful number, since it uses less digits than its factorization.

817216920528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233224091 (or 233224085 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 817216920528 in words is "eight hundred seventeen billion, two hundred sixteen million, nine hundred twenty thousand, five hundred twenty-eight".