636720495 has 16 divisors (see below), whose sum is σ = 1072371840. Its totient is φ = 321711264.

The previous prime is 636720481. The next prime is 636720517. The reversal of 636720495 is 594027636.

It is not a de Polignac number, because 636720495 - 2⁸ = 636720239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116769 + ... + 1117338.

It is an arithmetic number, because the mean of its divisors is an integer number (67023240).

Almost surely, 2^636720495 is an apocalyptic number.

636720495 is a deficient number, since it is larger than the sum of its proper divisors (435651345).

636720495 is a wasteful number, since it uses less digits than its factorization.

636720495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234134.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 636720495 is about 25233.3211250521. The cubic root of 636720495 is about 860.2993797243.

It can be divided in two parts, 6367 and 20495, that added together give a palindrome (26862).

The spelling of 636720495 in words is "six hundred thirty-six million, seven hundred twenty thousand, four hundred ninety-five".