636005945 has 16 divisors (see below), whose sum is σ = 774988032. Its totient is φ = 501007680.

The previous prime is 636005941. The next prime is 636005977. The reversal of 636005945 is 549500636.

It is not a de Polignac number, because 636005945 - 2² = 636005941 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 636005899 and 636005908.

It is not an unprimeable number, because it can be changed into a prime (636005941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89804 + ... + 96626.

It is an arithmetic number, because the mean of its divisors is an integer number (48436752).

Almost surely, 2^636005945 is an apocalyptic number.

It is an amenable number.

636005945 is a deficient number, since it is larger than the sum of its proper divisors (138982087).

636005945 is a wasteful number, since it uses less digits than its factorization.

636005945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7112.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 636005945 is about 25219.1582928535. The cubic root of 636005945 is about 859.9774399166.

The spelling of 636005945 in words is "six hundred thirty-six million, five thousand, nine hundred forty-five".