818671680 has 84 divisors (see below), whose sum is σ = 2815899372. Its totient is φ = 218311680.

The previous prime is 818671661. The next prime is 818671691. The reversal of 818671680 is 86176818.

It can be written as a sum of positive squares in 2 ways, for example, as 308634624 + 510037056 = 17568^2 + 22584^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139251 + ... + 145010.

Almost surely, 2^818671680 is an apocalyptic number.

818671680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

818671680 is an abundant number, since it is smaller than the sum of its proper divisors (1997227692).

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

818671680 is a wasteful number, since it uses less digits than its factorization.

818671680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284284 (or 284271 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 818671680 is about 28612.4392528844. The cubic root of 818671680 is about 935.4844849174.

The spelling of 818671680 in words is "eight hundred eighteen million, six hundred seventy-one thousand, six hundred eighty".