634996687 has 12 divisors (see below), whose sum is σ = 687562120. Its totient is φ = 582975792.

The previous prime is 634996679. The next prime is 634996697. The reversal of 634996687 is 786699436.

It is not a de Polignac number, because 634996687 - 2³ = 634996679 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 (634996667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1675264 + ... + 1675642.

Almost surely, 2^634996687 is an apocalyptic number.

634996687 is a deficient number, since it is larger than the sum of its proper divisors (52565433).

634996687 is an equidigital number, since it uses as much as digits as its factorization.

634996687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 751 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 58.

The square root of 634996687 is about 25199.1406004252. The cubic root of 634996687 is about 859.5223086269.

The spelling of 634996687 in words is "six hundred thirty-four million, nine hundred ninety-six thousand, six hundred eighty-seven".