1644742848 has 56 divisors (see below), whose sum is σ = 4973393152. Its totient is φ = 469926144.

The previous prime is 1644742777. The next prime is 1644742909. The reversal of 1644742848 is 8482474461.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×1644742848² = 5410358072094302208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1644742797 and 1644742806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610540 + ... + 613227.

It is an arithmetic number, because the mean of its divisors is an integer number (88810592).

Almost surely, 2^1644742848 is an apocalyptic number.

It is an amenable number.

1644742848 is an abundant number, since it is smaller than the sum of its proper divisors (3328650304).

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

1644742848 is a wasteful number, since it uses less digits than its factorization.

1644742848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223789 (or 1223779 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 48.

The square root of 1644742848 is about 40555.4293282663. The cubic root of 1644742848 is about 1180.4094260563.

It can be divided in two parts, 16447 and 42848, that added together give a palindrome (59295).

The spelling of 1644742848 in words is "one billion, six hundred forty-four million, seven hundred forty-two thousand, eight hundred forty-eight".