642299648 has 36 divisors (see below), whose sum is σ = 1284555888. Its totient is φ = 320532480.

The previous prime is 642299641. The next prime is 642299653. The reversal of 642299648 is 846992246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642299596 and 642299605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642299641) by changing a digit.

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, 149693 + ... + 153923.

It is an arithmetic number, because the mean of its divisors is an integer number (35682108).

Almost surely, 2^642299648 is an apocalyptic number.

It is an amenable number.

642299648 is a deficient number, since it is larger than the sum of its proper divisors (642256240).

642299648 is an equidigital number, since it uses as much as digits as its factorization.

642299648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840 (or 4826 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 642299648 is about 25343.6313104496. The cubic root of 642299648 is about 862.8048175011.

The spelling of 642299648 in words is "six hundred forty-two million, two hundred ninety-nine thousand, six hundred forty-eight".