636828481 has 4 divisors (see below), whose sum is σ = 636938964. Its totient is φ = 636718000.

The previous prime is 636828469. The next prime is 636828499. The reversal of 636828481 is 184828636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 427042225 + 209786256 = 20665^2 + 14484^2 .

It is a cyclic number.

It is not a de Polignac number, because 636828481 - 2¹¹ = 636826433 is a prime.

It is a super-2 number, since 2×636828481² = 811101028425534722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636828431) 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, 46090 + ... + 58291.

It is an arithmetic number, because the mean of its divisors is an integer number (159234741).

Almost surely, 2^636828481 is an apocalyptic number.

It is an amenable number.

636828481 is a deficient number, since it is larger than the sum of its proper divisors (110483).

636828481 is a wasteful number, since it uses less digits than its factorization.

636828481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110482.

The product of its digits is 442368, while the sum is 46.

The square root of 636828481 is about 25235.4607843804. The cubic root of 636828481 is about 860.3480117579.

The spelling of 636828481 in words is "six hundred thirty-six million, eight hundred twenty-eight thousand, four hundred eighty-one".