630540 has 72 divisors (see below), whose sum is σ = 1991808. Its totient is φ = 161280.

The previous prime is 630529. The next prime is 630559. The reversal of 630540 is 45036.

It is a happy number.

630540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5524 + ... + 5636.

It is an arithmetic number, because the mean of its divisors is an integer number (27664).

2⁶³⁰⁵⁴⁰ is an apocalyptic number.

630540 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 630540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995904).

630540 is an abundant number, since it is smaller than the sum of its proper divisors (1361268).

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

630540 is a wasteful number, since it uses less digits than its factorization.

630540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 630540 is about 794.0654884832. The cubic root of 630540 is about 85.7506750252.

Adding to 630540 its reverse (45036), we get a palindrome (675576).

The spelling of 630540 in words is "six hundred thirty thousand, five hundred forty".