642091082 has 8 divisors (see below), whose sum is σ = 972487776. Its totient is φ = 317928492.

The previous prime is 642091049. The next prime is 642091091. The reversal of 642091082 is 280190246.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1558268 + ... + 1558679.

It is an arithmetic number, because the mean of its divisors is an integer number (121560972).

Almost surely, 2^642091082 is an apocalyptic number.

642091082 is a deficient number, since it is larger than the sum of its proper divisors (330396694).

642091082 is a wasteful number, since it uses less digits than its factorization.

642091082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117052.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 642091082 is about 25339.5162147978. The cubic root of 642091082 is about 862.7114180877.

The spelling of 642091082 in words is "six hundred forty-two million, ninety-one thousand, eighty-two".