634590 has 48 divisors (see below), whose sum is σ = 1802736. Its totient is φ = 153600.

The previous prime is 634577. The next prime is 634597. The reversal of 634590 is 95436.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634597) by changing a digit.

634590 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 670 + ... + 1310.

It is an arithmetic number, because the mean of its divisors is an integer number (37557).

2⁶³⁴⁵⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901368).

634590 is an abundant number, since it is smaller than the sum of its proper divisors (1168146).

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

634590 is a wasteful number, since it uses less digits than its factorization.

634590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 634590 is about 796.6115741062. The cubic root of 634590 is about 85.9338774231.

It can be divided in two parts, 6 and 34590, that added together give a square (34596 = 186²).

The spelling of 634590 in words is "six hundred thirty-four thousand, five hundred ninety".