629640 has 128 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 149760.

The previous prime is 629623. The next prime is 629653. The reversal of 629640 is 46926.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

629640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11854 + ... + 11906.

It is an arithmetic number, because the mean of its divisors is an integer number (18225).

2⁶²⁹⁶⁴⁰ is an apocalyptic number.

629640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 629640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166400).

629640 is an abundant number, since it is smaller than the sum of its proper divisors (1703160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

629640 is a wasteful number, since it uses less digits than its factorization.

629640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 629640 is about 793.4985822294. The cubic root of 629640 is about 85.7098569140.

It can be divided in two parts, 6296 and 40, that added together give a palindrome (6336).

The spelling of 629640 in words is "six hundred twenty-nine thousand, six hundred forty".