818157220 has 12 divisors (see below), whose sum is σ = 1718130204. Its totient is φ = 327262880.

The previous prime is 818157217. The next prime is 818157227. The reversal of 818157220 is 22751818.

818157220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 350213796 + 467943424 = 18714^2 + 21632^2 .

It is not an unprimeable number, because it can be changed into a prime (818157227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20453911 + ... + 20453950.

It is an arithmetic number, because the mean of its divisors is an integer number (143177517).

Almost surely, 2^818157220 is an apocalyptic number.

It is an amenable number.

818157220 is an abundant number, since it is smaller than the sum of its proper divisors (899972984).

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

818157220 is a wasteful number, since it uses less digits than its factorization.

818157220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40907870 (or 40907868 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 818157220 is about 28603.4476942903. The cubic root of 818157220 is about 935.2884884815.

The spelling of 818157220 in words is "eight hundred eighteen million, one hundred fifty-seven thousand, two hundred twenty".