636776449 has 4 divisors (see below), whose sum is σ = 638140464. Its totient is φ = 635412436.

The previous prime is 636776447. The next prime is 636776473. The reversal of 636776449 is 944677636.

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 636776449 - 2¹ = 636776447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636776396 and 636776405.

It is not an unprimeable number, because it can be changed into a prime (636776447) 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, 681307 + ... + 682240.

It is an arithmetic number, because the mean of its divisors is an integer number (159535116).

Almost surely, 2^636776449 is an apocalyptic number.

It is an amenable number.

636776449 is a deficient number, since it is larger than the sum of its proper divisors (1364015).

636776449 is a wasteful number, since it uses less digits than its factorization.

636776449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364014.

The product of its digits is 4572288, while the sum is 52.

The square root of 636776449 is about 25234.4298330674. The cubic root of 636776449 is about 860.3245795736.

The spelling of 636776449 in words is "six hundred thirty-six million, seven hundred seventy-six thousand, four hundred forty-nine".