642089534 has 8 divisors (see below), whose sum is σ = 1013825640. Its totient is φ = 304147656.

The previous prime is 642089519. The next prime is 642089563. The reversal of 642089534 is 435980246.

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

It is a junction number, because it is equal to n+sod(n) for n = 642089491 and 642089500.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8448509 + ... + 8448584.

It is an arithmetic number, because the mean of its divisors is an integer number (126728205).

Almost surely, 2^642089534 is an apocalyptic number.

642089534 is a deficient number, since it is larger than the sum of its proper divisors (371736106).

642089534 is a wasteful number, since it uses less digits than its factorization.

642089534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16897114.

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 642089534 is about 25339.4856696027. The cubic root of 642089534 is about 862.7107247913.

The spelling of 642089534 in words is "six hundred forty-two million, eighty-nine thousand, five hundred thirty-four".