642012730 has 16 divisors (see below), whose sum is σ = 1195472520. Its totient is φ = 247949632.

The previous prime is 642012671. The next prime is 642012737. The reversal of 642012730 is 37210246.

It can be written as a sum of positive squares in 4 ways, for example, as 484836361 + 157176369 = 22019^2 + 12537^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642012695 and 642012704.

It is not an unprimeable number, because it can be changed into a prime (642012737) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1106629 + ... + 1107208.

Almost surely, 2^642012730 is an apocalyptic number.

642012730 is a deficient number, since it is larger than the sum of its proper divisors (553459790).

642012730 is a wasteful number, since it uses less digits than its factorization.

642012730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213873.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 642012730 is about 25337.9701239069. The cubic root of 642012730 is about 862.6763254991.

Adding to 642012730 its reverse (37210246), we get a palindrome (679222976).

The spelling of 642012730 in words is "six hundred forty-two million, twelve thousand, seven hundred thirty".