634380687 has 32 divisors (see below), whose sum is σ = 1038389760. Its totient is φ = 380730240.

The previous prime is 634380673. The next prime is 634380689. The reversal of 634380687 is 786083436.

634380687 is a `hidden beast` number, since 634 + 3 + 8 + 0 + 6 + 8 + 7 = 666.

It is not a de Polignac number, because 634380687 - 2⁴ = 634380671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634380689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19489 + ... + 40602.

It is an arithmetic number, because the mean of its divisors is an integer number (32449680).

Almost surely, 2^634380687 is an apocalyptic number.

634380687 is a deficient number, since it is larger than the sum of its proper divisors (404009073).

634380687 is a wasteful number, since it uses less digits than its factorization.

634380687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60140 (or 60134 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 634380687 is about 25186.9149956877. The cubic root of 634380687 is about 859.2442824817.

The spelling of 634380687 in words is "six hundred thirty-four million, three hundred eighty thousand, six hundred eighty-seven".