636545 has 16 divisors (see below), whose sum is σ = 940800. Its totient is φ = 402624.

The previous prime is 636541. The next prime is 636547. The reversal of 636545 is 545636.

It is a cyclic number.

It is not a de Polignac number, because 636545 - 2² = 636541 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636545.

It is not an unprimeable number, because it can be changed into a prime (636541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2⁶³⁶⁵⁴⁵ is an apocalyptic number.

636545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

636545 is a deficient number, since it is larger than the sum of its proper divisors (304255).

636545 is a wasteful number, since it uses less digits than its factorization.

636545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its digits is 10800, while the sum is 29.

The square root of 636545 is about 797.8377027942. The cubic root of 636545 is about 86.0220332945.

Subtracting from 636545 its reverse (545636), we obtain a palindrome (90909).

The spelling of 636545 in words is "six hundred thirty-six thousand, five hundred forty-five".