634645 has 12 divisors (see below), whose sum is σ = 837900. Its totient is φ = 461120.

The previous prime is 634643. The next prime is 634649. The reversal of 634645 is 546436.

It can be written as a sum of positive squares in 2 ways, for example, as 421201 + 213444 = 649^2 + 462^2 .

It is not a de Polignac number, because 634645 - 2¹ = 634643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (69825).

2⁶³⁴⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

634645 is a deficient number, since it is larger than the sum of its proper divisors (203255).

634645 is a wasteful number, since it uses less digits than its factorization.

634645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1065 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 634645 is about 796.6460945740. The cubic root of 634645 is about 85.9363599849.

Subtracting from 634645 its reverse (546436), we obtain a square (88209 = 297²).

The spelling of 634645 in words is "six hundred thirty-four thousand, six hundred forty-five".