1644008648 has 16 divisors (see below), whose sum is σ = 3084506880. Its totient is φ = 821473488.

The previous prime is 1644008617. The next prime is 1644008657. The reversal of 1644008648 is 8468004461.

It is a super-3 number, since 3×1644008648³ (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 3 ways as a sum of consecutive naturals, for example, 53036 + ... + 78107.

It is an arithmetic number, because the mean of its divisors is an integer number (192781680).

Almost surely, 2^1644008648 is an apocalyptic number.

It is an amenable number.

1644008648 is a deficient number, since it is larger than the sum of its proper divisors (1440498232).

1644008648 is a wasteful number, since it uses less digits than its factorization.

1644008648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132716 (or 132712 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 1644008648 is about 40546.3765088818. The cubic root of 1644008648 is about 1180.2337581517.

The spelling of 1644008648 in words is "one billion, six hundred forty-four million, eight thousand, six hundred forty-eight".