618223140 has 144 divisors (see below), whose sum is σ = 1987876800. Its totient is φ = 155084544.

The previous prime is 618223127. The next prime is 618223147. The reversal of 618223140 is 41322816.

618223140 is a `hidden beast` number, since 618 + 2 + 2 + 3 + 1 + 40 = 666.

It is not an unprimeable number, because it can be changed into a prime (618223147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 556906 + ... + 558014.

It is an arithmetic number, because the mean of its divisors is an integer number (13804700).

Almost surely, 2^618223140 is an apocalyptic number.

618223140 is a gapful number since it is divisible by the number (60) 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 618223140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993938400).

618223140 is an abundant number, since it is smaller than the sum of its proper divisors (1369653660).

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

618223140 is a wasteful number, since it uses less digits than its factorization.

618223140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306 (or 1301 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 618223140 is about 24864.0933878555. The cubic root of 618223140 is about 851.8865318706.

Adding to 618223140 its reverse (41322816), we get a palindrome (659545956).

The spelling of 618223140 in words is "six hundred eighteen million, two hundred twenty-three thousand, one hundred forty".