629640709 has 8 divisors (see below), whose sum is σ = 666271872. Its totient is φ = 593780880.

The previous prime is 629640707. The next prime is 629640733. The reversal of 629640709 is 907046926.

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

It is not a de Polignac number, because 629640709 - 2¹ = 629640707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629640707) 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 7 ways as a sum of consecutive naturals, for example, 191154 + ... + 194419.

It is an arithmetic number, because the mean of its divisors is an integer number (83283984).

Almost surely, 2^629640709 is an apocalyptic number.

It is an amenable number.

629640709 is a deficient number, since it is larger than the sum of its proper divisors (36631163).

629640709 is a wasteful number, since it uses less digits than its factorization.

629640709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385667.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 629640709 is about 25092.6425272429. The cubic root of 629640709 is about 857.0988908493.

The spelling of 629640709 in words is "six hundred twenty-nine million, six hundred forty thousand, seven hundred nine".