1644118228 has 12 divisors (see below), whose sum is σ = 2976421140. Its totient is φ = 793712192.

The previous prime is 1644118213. The next prime is 1644118243. The reversal of 1644118228 is 8228114461.

It is an interprime number because it is at equal distance from previous prime (1644118213) and next prime (1644118243).

It can be written as a sum of positive squares in 2 ways, for example, as 1251602884 + 392515344 = 35378^2 + 19812^2 .

It is a super-3 number, since 3×1644118228³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7086601 + ... + 7086832.

It is an arithmetic number, because the mean of its divisors is an integer number (248035095).

Almost surely, 2^1644118228 is an apocalyptic number.

It is an amenable number.

1644118228 is a deficient number, since it is larger than the sum of its proper divisors (1332302912).

1644118228 is a wasteful number, since it uses less digits than its factorization.

1644118228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14173466 (or 14173464 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 1644118228 is about 40547.7277785081. The cubic root of 1644118228 is about 1180.2599800620.

The spelling of 1644118228 in words is "one billion, six hundred forty-four million, one hundred eighteen thousand, two hundred twenty-eight".