1644673464 has 64 divisors (see below), whose sum is σ = 5221190400. Its totient is φ = 469906272.

The previous prime is 1644673451. The next prime is 1644673487. The reversal of 1644673464 is 4643764461.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 542362 + ... + 545385.

It is an arithmetic number, because the mean of its divisors is an integer number (81581100).

Almost surely, 2^1644673464 is an apocalyptic number.

1644673464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1644673464 is an abundant number, since it is smaller than the sum of its proper divisors (3576516936).

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

1644673464 is a wasteful number, since it uses less digits than its factorization.

1644673464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087769 (or 1087759 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 45.

The square root of 1644673464 is about 40554.5738974040. The cubic root of 1644673464 is about 1180.3928271739.

The spelling of 1644673464 in words is "one billion, six hundred forty-four million, six hundred seventy-three thousand, four hundred sixty-four".