636488 has 8 divisors (see below), whose sum is σ = 1193430. Its totient is φ = 318240.

The previous prime is 636473. The next prime is 636499. The reversal of 636488 is 884636.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 24964 = 782^2 + 158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

636488 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 as a sum of consecutive naturals, namely, 39773 + ... + 39788.

2⁶³⁶⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

636488 is a deficient number, since it is larger than the sum of its proper divisors (556942).

636488 is a wasteful number, since it uses less digits than its factorization.

636488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79567 (or 79563 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 636488 is about 797.8019804438. The cubic root of 636488 is about 86.0194655775.

The spelling of 636488 in words is "six hundred thirty-six thousand, four hundred eighty-eight".