639360 has 128 divisors (see below), whose sum is σ = 2325600. Its totient is φ = 165888.

The previous prime is 639337. The next prime is 639361. The reversal of 639360 is 63936.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639361) by changing a digit.

639360 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 15 ways as a sum of consecutive naturals, for example, 17262 + ... + 17298.

2⁶³⁹³⁶⁰ is an apocalyptic number.

639360 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 639360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1162800).

639360 is an abundant number, since it is smaller than the sum of its proper divisors (1686240).

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

639360 is a wasteful number, since it uses less digits than its factorization.

639360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 639360 is about 799.5998999500. The cubic root of 639360 is about 86.1486522248.

It can be divided in two parts, 639 and 360, that added together give a palindrome (999).

The spelling of 639360 in words is "six hundred thirty-nine thousand, three hundred sixty".