642605334 has 32 divisors (see below), whose sum is σ = 1470597120. Its totient is φ = 183378432.

The previous prime is 642605323. The next prime is 642605351. The reversal of 642605334 is 433506246.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642605295 and 642605304.

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 15 ways as a sum of consecutive naturals, for example, 27382 + ... + 45110.

It is an arithmetic number, because the mean of its divisors is an integer number (45956160).

Almost surely, 2^642605334 is an apocalyptic number.

642605334 is an abundant number, since it is smaller than the sum of its proper divisors (827991786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642605334 is a wasteful number, since it uses less digits than its factorization.

642605334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18604.

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 642605334 is about 25349.6614178572. The cubic root of 642605334 is about 862.9416723808.

The spelling of 642605334 in words is "six hundred forty-two million, six hundred five thousand, three hundred thirty-four".