635667 has 4 divisors (see below), whose sum is σ = 847560. Its totient is φ = 423776.

The previous prime is 635659. The next prime is 635689. The reversal of 635667 is 766536.

635667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 635667 - 2³ = 635659 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (635617) 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, 105942 + ... + 105947.

It is an arithmetic number, because the mean of its divisors is an integer number (211890).

2⁶³⁵⁶⁶⁷ is an apocalyptic number.

635667 is a deficient number, since it is larger than the sum of its proper divisors (211893).

635667 is a wasteful number, since it uses less digits than its factorization.

635667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211892.

The product of its digits is 22680, while the sum is 33.

The square root of 635667 is about 797.2872757043. The cubic root of 635667 is about 85.9824644254.

The spelling of 635667 in words is "six hundred thirty-five thousand, six hundred sixty-seven".