4044521640 has 128 divisors (see below), whose sum is σ = 13184409600. Its totient is φ = 988796160.

The previous prime is 4044521633. The next prime is 4044521681. The reversal of 4044521640 is 461254404.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 4044521598 and 4044521607.

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 31 ways as a sum of consecutive naturals, for example, 42069 + ... + 99291.

It is an arithmetic number, because the mean of its divisors is an integer number (103003200).

Almost surely, 2^4044521640 is an apocalyptic number.

4044521640 is a gapful number since it is divisible by the number (40) 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 4044521640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6592204800).

4044521640 is an abundant number, since it is smaller than the sum of its proper divisors (9139887960).

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

4044521640 is a wasteful number, since it uses less digits than its factorization.

4044521640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57287 (or 57283 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 4044521640 is about 63596.5536802113. The cubic root of 4044521640 is about 1593.2688101802.

The spelling of 4044521640 in words is "four billion, forty-four million, five hundred twenty-one thousand, six hundred forty".