816570138 has 16 divisors (see below), whose sum is σ = 1657516320. Its totient is φ = 268127376.

The previous prime is 816570119. The next prime is 816570187. The reversal of 816570138 is 831075618.

It is a junction number, because it is equal to n+sod(n) for n = 816570096 and 816570105.

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 7 ways as a sum of consecutive naturals, for example, 1015233 + ... + 1016036.

It is an arithmetic number, because the mean of its divisors is an integer number (103594770).

Almost surely, 2^816570138 is an apocalyptic number.

816570138 is an abundant number, since it is smaller than the sum of its proper divisors (840946182).

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

816570138 is a wasteful number, since it uses less digits than its factorization.

816570138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031341.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 816570138 is about 28575.6913827120. The cubic root of 816570138 is about 934.6833316174.

The spelling of 816570138 in words is "eight hundred sixteen million, five hundred seventy thousand, one hundred thirty-eight".