634667687 has 4 divisors (see below), whose sum is σ = 634843056. Its totient is φ = 634492320.

The previous prime is 634667669. The next prime is 634667753. The reversal of 634667687 is 786766436.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634667687 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 (634667087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82139 + ... + 89532.

It is an arithmetic number, because the mean of its divisors is an integer number (158710764).

Almost surely, 2^634667687 is an apocalyptic number.

634667687 is a deficient number, since it is larger than the sum of its proper divisors (175369).

634667687 is a wasteful number, since it uses less digits than its factorization.

634667687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175368.

The product of its digits is 6096384, while the sum is 53.

The square root of 634667687 is about 25192.6117542426. The cubic root of 634667687 is about 859.3738397728.

The spelling of 634667687 in words is "six hundred thirty-four million, six hundred sixty-seven thousand, six hundred eighty-seven".