634563845 has 16 divisors (see below), whose sum is σ = 809641008. Its totient is φ = 475791360.

The previous prime is 634563841. The next prime is 634563863. The reversal of 634563845 is 548365436.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 199883044 + 434680801 = 14138^2 + 20849^2 .

It is not a de Polignac number, because 634563845 - 2² = 634563841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 634563796 and 634563805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634563841) 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, 4997 + ... + 35973.

It is an arithmetic number, because the mean of its divisors is an integer number (50602563).

Almost surely, 2^634563845 is an apocalyptic number.

It is an amenable number.

634563845 is a deficient number, since it is larger than the sum of its proper divisors (175077163).

634563845 is a wasteful number, since it uses less digits than its factorization.

634563845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31240.

The product of its digits is 1036800, while the sum is 44.

The square root of 634563845 is about 25190.5507085494. The cubic root of 634563845 is about 859.3269680174.

The spelling of 634563845 in words is "six hundred thirty-four million, five hundred sixty-three thousand, eight hundred forty-five".