816175428 has 12 divisors (see below), whose sum is σ = 1904409360. Its totient is φ = 272058472.

The previous prime is 816175427. The next prime is 816175453. The reversal of 816175428 is 824571618.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×816175428² = 1332284658541966368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 816175428.

It is not an unprimeable number, because it can be changed into a prime (816175427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34007298 + ... + 34007321.

It is an arithmetic number, because the mean of its divisors is an integer number (158700780).

Almost surely, 2^816175428 is an apocalyptic number.

It is an amenable number.

816175428 is an abundant number, since it is smaller than the sum of its proper divisors (1088233932).

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

816175428 is a wasteful number, since it uses less digits than its factorization.

816175428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68014626 (or 68014624 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 816175428 is about 28568.7841533377. The cubic root of 816175428 is about 934.5327063372.

The spelling of 816175428 in words is "eight hundred sixteen million, one hundred seventy-five thousand, four hundred twenty-eight".