817642829 has 4 divisors (see below), whose sum is σ = 865739484. Its totient is φ = 769546176.

The previous prime is 817642817. The next prime is 817642843. The reversal of 817642829 is 928246718.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 416241604 + 401401225 = 20402^2 + 20035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-817642829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817642729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24048302 + ... + 24048335.

It is an arithmetic number, because the mean of its divisors is an integer number (216434871).

Almost surely, 2^817642829 is an apocalyptic number.

It is an amenable number.

817642829 is a deficient number, since it is larger than the sum of its proper divisors (48096655).

817642829 is a wasteful number, since it uses less digits than its factorization.

817642829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48096654.

The product of its digits is 387072, while the sum is 47.

The square root of 817642829 is about 28594.4545148181. The cubic root of 817642829 is about 935.0924361700.

The spelling of 817642829 in words is "eight hundred seventeen million, six hundred forty-two thousand, eight hundred twenty-nine".