636490 has 8 divisors (see below), whose sum is σ = 1145700. Its totient is φ = 254592.

The previous prime is 636473. The next prime is 636499. The reversal of 636490 is 94636.

636490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 32761 = 777^2 + 181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (636499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31815 + ... + 31834.

2⁶³⁶⁴⁹⁰ is an apocalyptic number.

636490 is a deficient number, since it is larger than the sum of its proper divisors (509210).

636490 is a wasteful number, since it uses less digits than its factorization.

636490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63656.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 636490 is about 797.8032338867. The cubic root of 636490 is about 86.0195556755.

The spelling of 636490 in words is "six hundred thirty-six thousand, four hundred ninety".