634890671 has 4 divisors (see below), whose sum is σ = 635040552. Its totient is φ = 634740792.

The previous prime is 634890647. The next prime is 634890691. The reversal of 634890671 is 176098436.

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

It is a cyclic number.

It is not a de Polignac number, because 634890671 - 2¹⁴ = 634874287 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 (634890631) 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, 68396 + ... + 77121.

It is an arithmetic number, because the mean of its divisors is an integer number (158760138).

Almost surely, 2^634890671 is an apocalyptic number.

634890671 is a deficient number, since it is larger than the sum of its proper divisors (149881).

634890671 is a wasteful number, since it uses less digits than its factorization.

634890671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149880.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 634890671 is about 25197.0369488160. The cubic root of 634890671 is about 859.4744720577.

The spelling of 634890671 in words is "six hundred thirty-four million, eight hundred ninety thousand, six hundred seventy-one".