818723680 has 48 divisors (see below), whose sum is σ = 2036044080. Its totient is φ = 310252032.

The previous prime is 818723657. The next prime is 818723681. The reversal of 818723680 is 86327818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818723681) 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, 131619 + ... + 137698.

It is an arithmetic number, because the mean of its divisors is an integer number (42417585).

Almost surely, 2^818723680 is an apocalyptic number.

818723680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

818723680 is an abundant number, since it is smaller than the sum of its proper divisors (1217320400).

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

818723680 is a wasteful number, since it uses less digits than its factorization.

818723680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269351 (or 269343 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 818723680 is about 28613.3479341373. The cubic root of 818723680 is about 935.5042910516.

The spelling of 818723680 in words is "eight hundred eighteen million, seven hundred twenty-three thousand, six hundred eighty".