817973320 has 16 divisors (see below), whose sum is σ = 1840440060. Its totient is φ = 327189312.

The previous prime is 817973291. The next prime is 817973341. The reversal of 817973320 is 23379718.

It can be written as a sum of positive squares in 2 ways, for example, as 698333476 + 119639844 = 26426^2 + 10938^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 20449333 = 817973320 / (8 + 1 + 7 + 9 + 7 + 3 + 3 + 2 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10224627 + ... + 10224706.

Almost surely, 2^817973320 is an apocalyptic number.

It is an amenable number.

817973320 is an abundant number, since it is smaller than the sum of its proper divisors (1022466740).

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

817973320 is a wasteful number, since it uses less digits than its factorization.

817973320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20449344 (or 20449340 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 817973320 is about 28600.2328661848. The cubic root of 817973320 is about 935.2184072316.

The spelling of 817973320 in words is "eight hundred seventeen million, nine hundred seventy-three thousand, three hundred twenty".