816506620 has 12 divisors (see below), whose sum is σ = 1714663944. Its totient is φ = 326602640.

The previous prime is 816506611. The next prime is 816506623. The reversal of 816506620 is 26605618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816506623) by changing a digit.

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, 20412646 + ... + 20412685.

It is an arithmetic number, because the mean of its divisors is an integer number (142888662).

Almost surely, 2^816506620 is an apocalyptic number.

It is an amenable number.

816506620 is an abundant number, since it is smaller than the sum of its proper divisors (898157324).

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

816506620 is a wasteful number, since it uses less digits than its factorization.

816506620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40825340 (or 40825338 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 816506620 is about 28574.5799619172. The cubic root of 816506620 is about 934.6590957914.

The spelling of 816506620 in words is "eight hundred sixteen million, five hundred six thousand, six hundred twenty".