634844687 has 2 divisors, whose sum is σ = 634844688. Its totient is φ = 634844686.

The previous prime is 634844671. The next prime is 634844761. The reversal of 634844687 is 786448436.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 634844687 - 2⁴ = 634844671 is a prime.

It is a super-2 number, since 2×634844687² = 806055553224255938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634844627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317422343 + 317422344.

It is an arithmetic number, because the mean of its divisors is an integer number (317422344).

Almost surely, 2^634844687 is an apocalyptic number.

634844687 is a deficient number, since it is larger than the sum of its proper divisors (1).

634844687 is an equidigital number, since it uses as much as digits as its factorization.

634844687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3096576, while the sum is 50.

The square root of 634844687 is about 25196.1244440489. The cubic root of 634844687 is about 859.4537214886.

The spelling of 634844687 in words is "six hundred thirty-four million, eight hundred forty-four thousand, six hundred eighty-seven".