1644364450 has 24 divisors (see below), whose sum is σ = 3133119780. Its totient is φ = 641702400.

The previous prime is 1644364429. The next prime is 1644364483. The reversal of 1644364450 is 544634461.

It can be written as a sum of positive squares in 6 ways, for example, as 418734369 + 1225630081 = 20463^2 + 35009^2 .

It is a super-3 number, since 3×1644364450³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399015 + ... + 403114.

Almost surely, 2^1644364450 is an apocalyptic number.

1644364450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1644364450 is a deficient number, since it is larger than the sum of its proper divisors (1488755330).

1644364450 is a wasteful number, since it uses less digits than its factorization.

1644364450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802182 (or 802177 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 1644364450 is about 40550.7638645686. The cubic root of 1644364450 is about 1180.3188954251.

The spelling of 1644364450 in words is "one billion, six hundred forty-four million, three hundred sixty-four thousand, four hundred fifty".