634520 has 32 divisors (see below), whose sum is σ = 1479600. Its totient is φ = 244608.

The previous prime is 634519. The next prime is 634523. The reversal of 634520 is 25436.

634520 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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 634492 and 634501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887 + ... + 1433.

2⁶³⁴⁵²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739800).

634520 is an abundant number, since it is smaller than the sum of its proper divisors (845080).

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

634520 is a wasteful number, since it uses less digits than its factorization.

634520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 634520 is about 796.5676368018. The cubic root of 634520 is about 85.9307175915.

Adding to 634520 its reverse (25436), we get a palindrome (659956).

The spelling of 634520 in words is "six hundred thirty-four thousand, five hundred twenty".