816821110 has 64 divisors (see below), whose sum is σ = 1717282944. Its totient is φ = 273945600.

The previous prime is 816821099. The next prime is 816821111. The reversal of 816821110 is 11128618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816821111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 994500 + ... + 995320.

It is an arithmetic number, because the mean of its divisors is an integer number (26832546).

Almost surely, 2^816821110 is an apocalyptic number.

816821110 is an abundant number, since it is smaller than the sum of its proper divisors (900461834).

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

816821110 is a wasteful number, since it uses less digits than its factorization.

816821110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its (nonzero) digits is 768, while the sum is 28.

The square root of 816821110 is about 28580.0824001611. The cubic root of 816821110 is about 934.7790797986.

Adding to 816821110 its reverse (11128618), we get a palindrome (827949728).

The spelling of 816821110 in words is "eight hundred sixteen million, eight hundred twenty-one thousand, one hundred ten".