817145984 has 16 divisors (see below), whose sum is σ = 1627908270. Its totient is φ = 408572928.

The previous prime is 817145983. The next prime is 817145993. The reversal of 817145984 is 489541718.

It can be written as a sum of positive squares in only one way, i.e., 541585984 + 275560000 = 23272^2 + 16600^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (817145983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3191849 + ... + 3192104.

Almost surely, 2^817145984 is an apocalyptic number.

It is an amenable number.

817145984 is a deficient number, since it is larger than the sum of its proper divisors (810762286).

817145984 is an equidigital number, since it uses as much as digits as its factorization.

817145984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6383967 (or 6383955 counting only the distinct ones).

The product of its digits is 322560, while the sum is 47.

The square root of 817145984 is about 28585.7654086785. The cubic root of 817145984 is about 934.9029931673.

The spelling of 817145984 in words is "eight hundred seventeen million, one hundred forty-five thousand, nine hundred eighty-four".