634666877 has 4 divisors (see below), whose sum is σ = 683487420. Its totient is φ = 585846336.

The previous prime is 634666867. The next prime is 634666927. The reversal of 634666877 is 778666436.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 321341476 + 313325401 = 17926^2 + 17701^2 .

It is a cyclic number.

It is not a de Polignac number, because 634666877 - 2¹² = 634662781 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 (634666867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24410252 + ... + 24410277.

It is an arithmetic number, because the mean of its divisors is an integer number (170871855).

Almost surely, 2^634666877 is an apocalyptic number.

It is an amenable number.

634666877 is a deficient number, since it is larger than the sum of its proper divisors (48820543).

634666877 is a wasteful number, since it uses less digits than its factorization.

634666877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48820542.

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

The square root of 634666877 is about 25192.5956780956. The cubic root of 634666877 is about 859.3734741782.

The spelling of 634666877 in words is "six hundred thirty-four million, six hundred sixty-six thousand, eight hundred seventy-seven".