636344487 has 24 divisors (see below), whose sum is σ = 944431488. Its totient is φ = 412650000.

The previous prime is 636344413. The next prime is 636344491. The reversal of 636344487 is 784443636.

636344487 is a `hidden beast` number, since 6 + 3 + 634 + 4 + 4 + 8 + 7 = 666.

It is not a de Polignac number, because 636344487 - 2²⁷ = 502126759 is a prime.

It is a super-2 number, since 2×636344487² = 809868612270586338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636344407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93862 + ... + 100412.

It is an arithmetic number, because the mean of its divisors is an integer number (39351312).

Almost surely, 2^636344487 is an apocalyptic number.

636344487 is a deficient number, since it is larger than the sum of its proper divisors (308087001).

636344487 is a wasteful number, since it uses less digits than its factorization.

636344487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851 (or 6848 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 45.

The square root of 636344487 is about 25225.8694002803. The cubic root of 636344487 is about 860.1299997278.

It can be divided in two parts, 63634 and 4487, that added together give a square (68121 = 261²).

The spelling of 636344487 in words is "six hundred thirty-six million, three hundred forty-four thousand, four hundred eighty-seven".