642526635 has 16 divisors (see below), whose sum is σ = 1030641696. Its totient is φ = 341814528.

The previous prime is 642526631. The next prime is 642526649. The reversal of 642526635 is 536625246.

642526635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642526635 - 2² = 642526631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642526593 and 642526602.

It is not an unprimeable number, because it can be changed into a prime (642526631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47994 + ... + 59903.

It is an arithmetic number, because the mean of its divisors is an integer number (64415106).

Almost surely, 2^642526635 is an apocalyptic number.

642526635 is a deficient number, since it is larger than the sum of its proper divisors (388115061).

642526635 is a wasteful number, since it uses less digits than its factorization.

642526635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108302.

The product of its digits is 259200, while the sum is 39.

The square root of 642526635 is about 25348.1091010750. The cubic root of 642526635 is about 862.9064431789.

The spelling of 642526635 in words is "six hundred forty-two million, five hundred twenty-six thousand, six hundred thirty-five".