816165420 has 48 divisors (see below), whose sum is σ = 2611730688. Its totient is φ = 186552000.

The previous prime is 816165409. The next prime is 816165443. The reversal of 816165420 is 24561618.

It is a super-2 number, since 2×816165420² = 1332251985607552800, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 971206 + ... + 972045.

It is an arithmetic number, because the mean of its divisors is an integer number (54411056).

Almost surely, 2^816165420 is an apocalyptic number.

It is an amenable number.

816165420 is an abundant number, since it is smaller than the sum of its proper divisors (1795565268).

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

816165420 is a wasteful number, since it uses less digits than its factorization.

816165420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943270 (or 1943268 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 816165420 is about 28568.6089965892. The cubic root of 816165420 is about 934.5288865531.

The spelling of 816165420 in words is "eight hundred sixteen million, one hundred sixty-five thousand, four hundred twenty".