1644213676 has 24 divisors (see below), whose sum is σ = 3294744320. Its totient is φ = 703309392.

The previous prime is 1644213671. The next prime is 1644213689. The reversal of 1644213676 is 6763124461.

It is a super-3 number, since 3×1644213676³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1644213671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41496 + ... + 70783.

Almost surely, 2^1644213676 is an apocalyptic number.

It is an amenable number.

1644213676 is an abundant number, since it is smaller than the sum of its proper divisors (1650530644).

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

1644213676 is a wasteful number, since it uses less digits than its factorization.

1644213676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112813 (or 112811 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 1644213676 is about 40548.9047447647. The cubic root of 1644213676 is about 1180.2828193106.

The spelling of 1644213676 in words is "one billion, six hundred forty-four million, two hundred thirteen thousand, six hundred seventy-six".