647629 has 4 divisors (see below), whose sum is σ = 649440. Its totient is φ = 645820.

The previous prime is 647627. The next prime is 647641. The reversal of 647629 is 926746.

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 647629 - 2¹ = 647627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647594 and 647603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647627) by changing a digit.

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, 169 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (162360).

2⁶⁴⁷⁶²⁹ is an apocalyptic number.

It is an amenable number.

647629 is a deficient number, since it is larger than the sum of its proper divisors (1811).

647629 is a wasteful number, since it uses less digits than its factorization.

647629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810.

The product of its digits is 18144, while the sum is 34.

The square root of 647629 is about 804.7539996794. The cubic root of 647629 is about 86.5184564179.

The spelling of 647629 in words is "six hundred forty-seven thousand, six hundred twenty-nine".