642042626 has 8 divisors (see below), whose sum is σ = 963670284. Its totient is φ = 320819200.

The previous prime is 642042613. The next prime is 642042641. The reversal of 642042626 is 626240246.

It can be written as a sum of positive squares in 2 ways, for example, as 612612001 + 29430625 = 24751^2 + 5425^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 642042592 and 642042601.

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, 97055 + ... + 103458.

Almost surely, 2^642042626 is an apocalyptic number.

642042626 is a deficient number, since it is larger than the sum of its proper divisors (321627658).

642042626 is a wasteful number, since it uses less digits than its factorization.

642042626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202116.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 642042626 is about 25338.5600616925. The cubic root of 642042626 is about 862.6897157689.

The spelling of 642042626 in words is "six hundred forty-two million, forty-two thousand, six hundred twenty-six".