642834086 has 4 divisors (see below), whose sum is σ = 964251132. Its totient is φ = 321417042.

The previous prime is 642834083. The next prime is 642834103. The reversal of 642834086 is 680438246.

642834086 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 680438246 = 2 ⋅340219123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642834083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160708520 + ... + 160708523.

It is an arithmetic number, because the mean of its divisors is an integer number (241062783).

Almost surely, 2^642834086 is an apocalyptic number.

642834086 is a deficient number, since it is larger than the sum of its proper divisors (321417046).

642834086 is a wasteful number, since it uses less digits than its factorization.

642834086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321417045.

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 642834086 is about 25354.1729504238. The cubic root of 642834086 is about 863.0440557072.

The spelling of 642834086 in words is "six hundred forty-two million, eight hundred thirty-four thousand, eighty-six".