642426424 has 8 divisors (see below), whose sum is σ = 1204549560. Its totient is φ = 321213208.

The previous prime is 642426419. The next prime is 642426437. The reversal of 642426424 is 424624246.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 642426424.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40151644 + ... + 40151659.

It is an arithmetic number, because the mean of its divisors is an integer number (150568695).

Almost surely, 2^642426424 is an apocalyptic number.

It is an amenable number.

642426424 is a deficient number, since it is larger than the sum of its proper divisors (562123136).

642426424 is a wasteful number, since it uses less digits than its factorization.

642426424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80303309 (or 80303305 counting only the distinct ones).

The product of its digits is 73728, while the sum is 34.

The square root of 642426424 is about 25346.1323282271. The cubic root of 642426424 is about 862.8615800771.

The spelling of 642426424 in words is "six hundred forty-two million, four hundred twenty-six thousand, four hundred twenty-four".