818720693280 has 1152 divisors, whose sum is σ = 3422144194560. Its totient is φ = 180980490240.

The previous prime is 818720693267. The next prime is 818720693291. The reversal of 818720693280 is 82396027818.

It is a happy number.

818720693280 is a `hidden beast` number, since 81 + 87 + 206 + 9 + 3 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1075848100 + ... + 1075848860.

It is an arithmetic number, because the mean of its divisors is an integer number (2970611280).

Almost surely, 2^818720693280 is an apocalyptic number.

818720693280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818720693280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711072097280).

818720693280 is an abundant number, since it is smaller than the sum of its proper divisors (2603423501280).

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

818720693280 is a wasteful number, since it uses less digits than its factorization.

818720693280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 818720693280 in words is "eight hundred eighteen billion, seven hundred twenty million, six hundred ninety-three thousand, two hundred eighty".