1646804544 has 168 divisors, whose sum is σ = 5529669408. Its totient is φ = 427714560.

The previous prime is 1646804521. The next prime is 1646804563. The reversal of 1646804544 is 4454086461.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×1646804544² = 5423930412278095872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1646804496 and 1646804505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95532 + ... + 111444.

Almost surely, 2^1646804544 is an apocalyptic number.

1646804544 is a gapful number since it is divisible by the number (14) 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 1646804544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2764834704).

1646804544 is an abundant number, since it is smaller than the sum of its proper divisors (3882864864).

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

1646804544 is a wasteful number, since it uses less digits than its factorization.

1646804544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15953 (or 15936 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 42.

The square root of 1646804544 is about 40580.8396167452. The cubic root of 1646804544 is about 1180.9024371145.

The spelling of 1646804544 in words is "one billion, six hundred forty-six million, eight hundred four thousand, five hundred forty-four".