642446242 has 4 divisors (see below), whose sum is σ = 963669366. Its totient is φ = 321223120.

The previous prime is 642446239. The next prime is 642446279. The reversal of 642446242 is 242644246.

642446242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 332369361 + 310076881 = 18231^2 + 17609^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642446198 and 642446207.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160611559 + ... + 160611562.

Almost surely, 2^642446242 is an apocalyptic number.

642446242 is a deficient number, since it is larger than the sum of its proper divisors (321223124).

642446242 is a wasteful number, since it uses less digits than its factorization.

642446242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321223123.

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

The square root of 642446242 is about 25346.5232724332. The cubic root of 642446242 is about 862.8704526962.

The spelling of 642446242 in words is "six hundred forty-two million, four hundred forty-six thousand, two hundred forty-two".