642279629 has 4 divisors (see below), whose sum is σ = 676083840. Its totient is φ = 608475420.

The previous prime is 642279613. The next prime is 642279641. The reversal of 642279629 is 926972246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642279629 - 2⁴ = 642279613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642279679) 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, 16902077 + ... + 16902114.

It is an arithmetic number, because the mean of its divisors is an integer number (169020960).

Almost surely, 2^642279629 is an apocalyptic number.

It is an amenable number.

642279629 is a deficient number, since it is larger than the sum of its proper divisors (33804211).

642279629 is a wasteful number, since it uses less digits than its factorization.

642279629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33804210.

The product of its digits is 653184, while the sum is 47.

The square root of 642279629 is about 25343.2363560773. The cubic root of 642279629 is about 862.7958535286.

The spelling of 642279629 in words is "six hundred forty-two million, two hundred seventy-nine thousand, six hundred twenty-nine".