642448 has 10 divisors (see below), whose sum is σ = 1244774. Its totient is φ = 321216.

The previous prime is 642427. The next prime is 642457. The reversal of 642448 is 844246.

It can be written as a sum of positive squares in only one way, i.e., 559504 + 82944 = 748^2 + 288^2 .

It is a d-powerful number, because it can be written as 6⁷ + 4² + 4⁸ + 2¹¹ + 4⁹ + 8⁵ .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20061 + ... + 20092.

2⁶⁴²⁴⁴⁸ is an apocalyptic number.

It is an amenable number.

642448 is a deficient number, since it is larger than the sum of its proper divisors (602326).

642448 is a wasteful number, since it uses less digits than its factorization.

642448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40161 (or 40155 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 642448 is about 801.5285397289. The cubic root of 642448 is about 86.2871239753.

The spelling of 642448 in words is "six hundred forty-two thousand, four hundred forty-eight".