818366520 has 128 divisors (see below), whose sum is σ = 2550528000. Its totient is φ = 209840640.

The previous prime is 818366509. The next prime is 818366543. The reversal of 818366520 is 25663818.

It is a happy number.

It is a super-2 number, since 2×818366520² = 1339447522113820800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665266 + ... + 666494.

It is an arithmetic number, because the mean of its divisors is an integer number (19926000).

Almost surely, 2^818366520 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 818366520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1275264000).

818366520 is an abundant number, since it is smaller than the sum of its proper divisors (1732161480).

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

818366520 is a wasteful number, since it uses less digits than its factorization.

818366520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 818366520 is about 28607.1061101958. The cubic root of 818366520 is about 935.3682364751.

The spelling of 818366520 in words is "eight hundred eighteen million, three hundred sixty-six thousand, five hundred twenty".