4020045640 has 64 divisors (see below), whose sum is σ = 9832052160. Its totient is φ = 1470432000.

The previous prime is 4020045637. The next prime is 4020045647. The reversal of 4020045640 is 465400204.

It is not an unprimeable number, because it can be changed into a prime (4020045647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19515 + ... + 91765.

It is an arithmetic number, because the mean of its divisors is an integer number (153625815).

Almost surely, 2^4020045640 is an apocalyptic number.

4020045640 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 4020045640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4916026080).

4020045640 is an abundant number, since it is smaller than the sum of its proper divisors (5812006520).

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

4020045640 is a wasteful number, since it uses less digits than its factorization.

4020045640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72382 (or 72378 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 4020045640 is about 63403.8298527778. The cubic root of 4020045640 is about 1590.0483404999.

Adding to 4020045640 its reverse (465400204), we get a palindrome (4485445844).

The spelling of 4020045640 in words is "four billion, twenty million, forty-five thousand, six hundred forty".