1644100404 has 24 divisors (see below), whose sum is σ = 3893493408. Its totient is φ = 539853600.

The previous prime is 1644100397. The next prime is 1644100427. The reversal of 1644100404 is 4040014461.

It is a super-3 number, since 3×1644100404³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

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, 1021647 + ... + 1023254.

It is an arithmetic number, because the mean of its divisors is an integer number (162228892).

Almost surely, 2^1644100404 is an apocalyptic number.

It is an amenable number.

1644100404 is an abundant number, since it is smaller than the sum of its proper divisors (2249393004).

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

1644100404 is a wasteful number, since it uses less digits than its factorization.

1644100404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044975 (or 2044973 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1644100404 is about 40547.5079875447. The cubic root of 1644100404 is about 1180.2557149531.

Adding to 1644100404 its reverse (4040014461), we get a palindrome (5684114865).

The spelling of 1644100404 in words is "one billion, six hundred forty-four million, one hundred thousand, four hundred four".