420240644 has 12 divisors (see below), whose sum is σ = 740106444. Its totient is φ = 208781664.

The previous prime is 420240577. The next prime is 420240661. The reversal of 420240644 is 446042024.

It can be written as a sum of positive squares in 2 ways, for example, as 320839744 + 99400900 = 17912^2 + 9970^2 .

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 3 ways as a sum of consecutive naturals, for example, 333959 + ... + 335214.

It is an arithmetic number, because the mean of its divisors is an integer number (61675537).

Almost surely, 2^420240644 is an apocalyptic number.

It is an amenable number.

420240644 is a deficient number, since it is larger than the sum of its proper divisors (319865800).

420240644 is a wasteful number, since it uses less digits than its factorization.

420240644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669334 (or 669332 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 420240644 is about 20499.7718036080. The cubic root of 420240644 is about 749.0302393669.

Adding to 420240644 its reverse (446042024), we get a palindrome (866282668).

The spelling of 420240644 in words is "four hundred twenty million, two hundred forty thousand, six hundred forty-four".