816220180 has 24 divisors (see below), whose sum is σ = 1714890240. Its totient is φ = 326330400.

The previous prime is 816220147. The next prime is 816220187. The reversal of 816220180 is 81022618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816220187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38341 + ... + 55699.

It is an arithmetic number, because the mean of its divisors is an integer number (71453760).

Almost surely, 2^816220180 is an apocalyptic number.

It is an amenable number.

816220180 is an abundant number, since it is smaller than the sum of its proper divisors (898670060).

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

816220180 is a wasteful number, since it uses less digits than its factorization.

816220180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19719 (or 19717 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 816220180 is about 28569.5673750934. The cubic root of 816220180 is about 934.5497865881.

Adding to 816220180 its reverse (81022618), we get a palindrome (897242798).

The spelling of 816220180 in words is "eight hundred sixteen million, two hundred twenty thousand, one hundred eighty".