4045640420 has 24 divisors (see below), whose sum is σ = 8498617848. Its totient is φ = 1617728000.

The previous prime is 4045640413. The next prime is 4045640449. The reversal of 4045640420 is 240465404.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 177795556 + 3867844864 = 13334^2 + 62192^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33020 + ... + 95820.

It is an arithmetic number, because the mean of its divisors is an integer number (354109077).

Almost surely, 2^4045640420 is an apocalyptic number.

It is an amenable number.

4045640420 is an abundant number, since it is smaller than the sum of its proper divisors (4452977428).

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

4045640420 is a wasteful number, since it uses less digits than its factorization.

4045640420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66031 (or 66029 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 4045640420 is about 63605.3489889019. The cubic root of 4045640420 is about 1593.4157045974.

The spelling of 4045640420 in words is "four billion, forty-five million, six hundred forty thousand, four hundred twenty".