4000321644 has 48 divisors (see below), whose sum is σ = 10625368320. Its totient is φ = 1159512640.

The previous prime is 4000321643. The next prime is 4000321687. The reversal of 4000321644 is 4461230004.

It is not an unprimeable number, because it can be changed into a prime (4000321643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655779 + ... + 661850.

It is an arithmetic number, because the mean of its divisors is an integer number (221361840).

Almost surely, 2^4000321644 is an apocalyptic number.

4000321644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

4000321644 is an abundant number, since it is smaller than the sum of its proper divisors (6625046676).

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

4000321644 is a wasteful number, since it uses less digits than its factorization.

4000321644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317670 (or 1317668 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 4000321644 is about 63248.0959713413. The cubic root of 4000321644 is about 1587.4435989965.

Adding to 4000321644 its reverse (4461230004), we get a palindrome (8461551648).

The spelling of 4000321644 in words is "four billion, three hundred twenty-one thousand, six hundred forty-four".