642249067 has 4 divisors (see below), whose sum is σ = 644636880. Its totient is φ = 639861256.

The previous prime is 642249059. The next prime is 642249089. The reversal of 642249067 is 760942246.

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 642249067 - 2³ = 642249059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642249007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193503 + ... + 1194040.

It is an arithmetic number, because the mean of its divisors is an integer number (161159220).

Almost surely, 2^642249067 is an apocalyptic number.

642249067 is a deficient number, since it is larger than the sum of its proper divisors (2387813).

642249067 is a wasteful number, since it uses less digits than its factorization.

642249067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387812.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 642249067 is about 25342.6333872390. The cubic root of 642249067 is about 862.7821683236.

The spelling of 642249067 in words is "six hundred forty-two million, two hundred forty-nine thousand, sixty-seven".