642243346 has 4 divisors (see below), whose sum is σ = 963365022. Its totient is φ = 321121672.

The previous prime is 642243331. The next prime is 642243359. The reversal of 642243346 is 643342246.

642243346 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., 605701321 + 36542025 = 24611^2 + 6045^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160560835 + ... + 160560838.

Almost surely, 2^642243346 is an apocalyptic number.

642243346 is a deficient number, since it is larger than the sum of its proper divisors (321121676).

642243346 is a wasteful number, since it uses less digits than its factorization.

642243346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321121675.

The product of its digits is 82944, while the sum is 34.

The square root of 642243346 is about 25342.5205139505. The cubic root of 642243346 is about 862.7796064974.

The spelling of 642243346 in words is "six hundred forty-two million, two hundred forty-three thousand, three hundred forty-six".