1644442102 has 8 divisors (see below), whose sum is σ = 2466968112. Its totient is φ = 822119400.

The previous prime is 1644442091. The next prime is 1644442103. The reversal of 1644442102 is 2012444461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644442103) 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 3 ways as a sum of consecutive naturals, for example, 28674 + ... + 64117.

It is an arithmetic number, because the mean of its divisors is an integer number (308371014).

Almost surely, 2^1644442102 is an apocalyptic number.

1644442102 is a deficient number, since it is larger than the sum of its proper divisors (822526010).

1644442102 is an equidigital number, since it uses as much as digits as its factorization.

1644442102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101654.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 1644442102 is about 40551.7213198158. The cubic root of 1644442102 is about 1180.3374745749.

Adding to 1644442102 its reverse (2012444461), we get a palindrome (3656886563).

The spelling of 1644442102 in words is "one billion, six hundred forty-four million, four hundred forty-two thousand, one hundred two".