642635126 has 8 divisors (see below), whose sum is σ = 1101660240. Its totient is φ = 275415048.

The previous prime is 642635117. The next prime is 642635141. The reversal of 642635126 is 621536246.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22951241 + ... + 22951268.

It is an arithmetic number, because the mean of its divisors is an integer number (137707530).

Almost surely, 2^642635126 is an apocalyptic number.

642635126 is a deficient number, since it is larger than the sum of its proper divisors (459025114).

642635126 is a wasteful number, since it uses less digits than its factorization.

642635126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45902518.

The product of its digits is 51840, while the sum is 35.

The square root of 642635126 is about 25350.2490323074. The cubic root of 642635126 is about 862.9550078656.

The spelling of 642635126 in words is "six hundred forty-two million, six hundred thirty-five thousand, one hundred twenty-six".