1644798960 has 640 divisors, whose sum is σ = 7028121600. Its totient is φ = 349360128.

The previous prime is 1644798929. The next prime is 1644799001. The reversal of 1644798960 is 698974461.

1644798960 is a `hidden beast` number, since 164 + 479 + 8 + 9 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1644798897 and 1644798906.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 20820201 + ... + 20820279.

It is an arithmetic number, because the mean of its divisors is an integer number (10981440).

Almost surely, 2^1644798960 is an apocalyptic number.

1644798960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644798960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3514060800).

1644798960 is an abundant number, since it is smaller than the sum of its proper divisors (5383322640).

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

1644798960 is an equidigital number, since it uses as much as digits as its factorization.

1644798960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 1644798960 is about 40556.1211163001. The cubic root of 1644798960 is about 1180.4228495084.

The spelling of 1644798960 in words is "one billion, six hundred forty-four million, seven hundred ninety-eight thousand, nine hundred sixty".