618449188 has 72 divisors (see below), whose sum is σ = 1339557912. Its totient is φ = 248242176.

The previous prime is 618449173. The next prime is 618449189. The reversal of 618449188 is 881944816.

It can be written as a sum of positive squares in 4 ways, for example, as 36578304 + 581870884 = 6048^2 + 24122^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618449189) 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 23 ways as a sum of consecutive naturals, for example, 1042620 + ... + 1043212.

It is an arithmetic number, because the mean of its divisors is an integer number (18604971).

Almost surely, 2^618449188 is an apocalyptic number.

618449188 is a gapful number since it is divisible by the number (68) 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 618449188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669778956).

618449188 is an abundant number, since it is smaller than the sum of its proper divisors (721108724).

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

618449188 is a wasteful number, since it uses less digits than its factorization.

618449188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941 (or 932 counting only the distinct ones).

The product of its digits is 442368, while the sum is 49.

The square root of 618449188 is about 24868.6386438824. The cubic root of 618449188 is about 851.9903475583.

The spelling of 618449188 in words is "six hundred eighteen million, four hundred forty-nine thousand, one hundred eighty-eight".