818864340 has 96 divisors (see below), whose sum is σ = 2629159680. Its totient is φ = 186541056.

The previous prime is 818864339. The next prime is 818864359. The reversal of 818864340 is 43468818.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 818864292 and 818864301.

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, 128346 + ... + 134574.

It is an arithmetic number, because the mean of its divisors is an integer number (27387080).

Almost surely, 2^818864340 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 818864340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1314579840).

818864340 is an abundant number, since it is smaller than the sum of its proper divisors (1810295340).

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

818864340 is a wasteful number, since it uses less digits than its factorization.

818864340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561 (or 6559 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 818864340 is about 28615.8057723350. The cubic root of 818864340 is about 935.5578624423.

The spelling of 818864340 in words is "eight hundred eighteen million, eight hundred sixty-four thousand, three hundred forty".