816620 has 48 divisors (see below), whose sum is σ = 2069760. Its totient is φ = 264384.

The previous prime is 816593. The next prime is 816649. The reversal of 816620 is 26618.

816620 is nontrivially palindromic in base 6.

It is an unprimeable number.

816620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2507 + ... + 2813.

It is an arithmetic number, because the mean of its divisors is an integer number (43120).

2⁸¹⁶⁶²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034880).

816620 is an abundant number, since it is smaller than the sum of its proper divisors (1253140).

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

816620 is a wasteful number, since it uses less digits than its factorization.

816620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 816620 is about 903.6702938572. The cubic root of 816620 is about 93.4702356001.

The spelling of 816620 in words is "eight hundred sixteen thousand, six hundred twenty".