642553854 has 8 divisors (see below), whose sum is σ = 1285107720. Its totient is φ = 214184616.

The previous prime is 642553831. The next prime is 642553871. The reversal of 642553854 is 458355246.

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

642553854 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53546149 + ... + 53546160.

It is an arithmetic number, because the mean of its divisors is an integer number (160638465).

Almost surely, 2^642553854 is an apocalyptic number.

642553854 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.

642553854 is a wasteful number, since it uses less digits than its factorization.

642553854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107092314.

The product of its digits is 576000, while the sum is 42.

The square root of 642553854 is about 25348.6459993428. The cubic root of 642553854 is about 862.9186279494.

The spelling of 642553854 in words is "six hundred forty-two million, five hundred fifty-three thousand, eight hundred fifty-four".