642734934 has 16 divisors (see below), whose sum is σ = 1286178672. Its totient is φ = 214126848.

The previous prime is 642734933. The next prime is 642734941. The reversal of 642734934 is 439437246.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642734933) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17359 + ... + 39834.

It is an arithmetic number, because the mean of its divisors is an integer number (80386167).

Almost surely, 2^642734934 is an apocalyptic number.

642734934 is an abundant number, since it is smaller than the sum of its proper divisors (643443738).

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

642734934 is a wasteful number, since it uses less digits than its factorization.

642734934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59071.

The product of its digits is 435456, while the sum is 42.

The square root of 642734934 is about 25352.2175361446. The cubic root of 642734934 is about 862.9996808853. Note that the first 3 decimals are identical.

The spelling of 642734934 in words is "six hundred forty-two million, seven hundred thirty-four thousand, nine hundred thirty-four".