636604481 has 4 divisors (see below), whose sum is σ = 670110000. Its totient is φ = 603098964.

The previous prime is 636604477. The next prime is 636604489. The reversal of 636604481 is 184406636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 636604481 - 2² = 636604477 is a prime.

It is a super-2 number, since 2×636604481² = 810530530458558722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636604489) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16752731 + ... + 16752768.

It is an arithmetic number, because the mean of its divisors is an integer number (167527500).

Almost surely, 2^636604481 is an apocalyptic number.

It is an amenable number.

636604481 is a deficient number, since it is larger than the sum of its proper divisors (33505519).

636604481 is a wasteful number, since it uses less digits than its factorization.

636604481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33505518.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 636604481 is about 25231.0221949092. The cubic root of 636604481 is about 860.2471261136.

The spelling of 636604481 in words is "six hundred thirty-six million, six hundred four thousand, four hundred eighty-one".