642853434 has 8 divisors (see below), whose sum is σ = 1285706880. Its totient is φ = 214284476.

The previous prime is 642853433. The next prime is 642853481. The reversal of 642853434 is 434358246.

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

642853434 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642853392 and 642853401.

It is not an unprimeable number, because it can be changed into a prime (642853433) by changing a digit.

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, 53571114 + ... + 53571125.

It is an arithmetic number, because the mean of its divisors is an integer number (160713360).

Almost surely, 2^642853434 is an apocalyptic number.

642853434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642853434 is a wasteful number, since it uses less digits than its factorization.

642853434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107142244.

The product of its digits is 276480, while the sum is 39.

The square root of 642853434 is about 25354.5545021008. The cubic root of 642853434 is about 863.0527142445.

The spelling of 642853434 in words is "six hundred forty-two million, eight hundred fifty-three thousand, four hundred thirty-four".