635649 has 8 divisors (see below), whose sum is σ = 968640. Its totient is φ = 363216.

The previous prime is 635639. The next prime is 635653. The reversal of 635649 is 946536.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 635649 - 2⁵ = 635617 is a prime.

It is a Curzon number.

635649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (635639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15114 + ... + 15155.

It is an arithmetic number, because the mean of its divisors is an integer number (121080).

2⁶³⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

635649 is a deficient number, since it is larger than the sum of its proper divisors (332991).

635649 is a wasteful number, since it uses less digits than its factorization.

635649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30279.

The product of its digits is 19440, while the sum is 33.

The square root of 635649 is about 797.2759873469. The cubic root of 635649 is about 85.9816528375.

The spelling of 635649 in words is "six hundred thirty-five thousand, six hundred forty-nine".