635887 has 4 divisors (see below), whose sum is σ = 726736. Its totient is φ = 545040.

The previous prime is 635879. The next prime is 635891. The reversal of 635887 is 788536.

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 635887 - 2³ = 635879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635837) 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, 45414 + ... + 45427.

It is an arithmetic number, because the mean of its divisors is an integer number (181684).

2⁶³⁵⁸⁸⁷ is an apocalyptic number.

635887 is a deficient number, since it is larger than the sum of its proper divisors (90849).

635887 is an equidigital number, since it uses as much as digits as its factorization.

635887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90848.

The product of its digits is 40320, while the sum is 37.

The square root of 635887 is about 797.4252316048. The cubic root of 635887 is about 85.9923825955.

It can be divided in two parts, 63 and 5887, that multiplied together give a square (370881 = 609²).

The spelling of 635887 in words is "six hundred thirty-five thousand, eight hundred eighty-seven".