642726068 has 6 divisors (see below), whose sum is σ = 1124770626. Its totient is φ = 321363032.

The previous prime is 642726061. The next prime is 642726083. The reversal of 642726068 is 860627246.

642726068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 614444944 + 28281124 = 24788^2 + 5318^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642726061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80340755 + ... + 80340762.

It is an arithmetic number, because the mean of its divisors is an integer number (187461771).

Almost surely, 2^642726068 is an apocalyptic number.

It is an amenable number.

642726068 is a deficient number, since it is larger than the sum of its proper divisors (482044558).

642726068 is a wasteful number, since it uses less digits than its factorization.

642726068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160681521 (or 160681519 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 642726068 is about 25352.0426790426. The cubic root of 642726068 is about 862.9957127433.

The spelling of 642726068 in words is "six hundred forty-two million, seven hundred twenty-six thousand, sixty-eight".