817842428 has 12 divisors (see below), whose sum is σ = 1541318520. Its totient is φ = 377465712.

The previous prime is 817842419. The next prime is 817842437. The reversal of 817842428 is 824248718.

It is an interprime number because it is at equal distance from previous prime (817842419) and next prime (817842437).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7863818 + ... + 7863921.

It is an arithmetic number, because the mean of its divisors is an integer number (128443210).

Almost surely, 2^817842428 is an apocalyptic number.

It is an amenable number.

817842428 is a deficient number, since it is larger than the sum of its proper divisors (723476092).

817842428 is a wasteful number, since it uses less digits than its factorization.

817842428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15727756 (or 15727754 counting only the distinct ones).

The product of its digits is 229376, while the sum is 44.

The square root of 817842428 is about 28597.9444715875. The cubic root of 817842428 is about 935.1685200553.

The spelling of 817842428 in words is "eight hundred seventeen million, eight hundred forty-two thousand, four hundred twenty-eight".