642006067 has 4 divisors (see below), whose sum is σ = 675795880. Its totient is φ = 608216256.

The previous prime is 642006059. The next prime is 642006097. The reversal of 642006067 is 760600246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642006067 - 2³ = 642006059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642006007) 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, 16894878 + ... + 16894915.

It is an arithmetic number, because the mean of its divisors is an integer number (168948970).

Almost surely, 2^642006067 is an apocalyptic number.

642006067 is a deficient number, since it is larger than the sum of its proper divisors (33789813).

642006067 is a wasteful number, since it uses less digits than its factorization.

642006067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33789812.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 642006067 is about 25337.8386410522. The cubic root of 642006067 is about 862.6733411178.

The spelling of 642006067 in words is "six hundred forty-two million, six thousand, sixty-seven".