631660 has 12 divisors (see below), whose sum is σ = 1326528. Its totient is φ = 252656.

The previous prime is 631643. The next prime is 631667. The reversal of 631660 is 66136.

631660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (631667) by changing a digit.

631660 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 3 ways as a sum of consecutive naturals, for example, 15772 + ... + 15811.

It is an arithmetic number, because the mean of its divisors is an integer number (110544).

2⁶³¹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

631660 is an abundant number, since it is smaller than the sum of its proper divisors (694868).

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

631660 is a wasteful number, since it uses less digits than its factorization.

631660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31592 (or 31590 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 631660 is about 794.7704070988. The cubic root of 631660 is about 85.8014166899.

Adding to 631660 its reverse (66136), we get a palindrome (697796).

The spelling of 631660 in words is "six hundred thirty-one thousand, six hundred sixty".