634256647 has 4 divisors (see below), whose sum is σ = 634308840. Its totient is φ = 634204456.

The previous prime is 634256629. The next prime is 634256677. The reversal of 634256647 is 746652436.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634256647 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 (634256617) 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, 2793 + ... + 35725.

It is an arithmetic number, because the mean of its divisors is an integer number (158577210).

Almost surely, 2^634256647 is an apocalyptic number.

634256647 is a deficient number, since it is larger than the sum of its proper divisors (52193).

634256647 is a wasteful number, since it uses less digits than its factorization.

634256647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52192.

The product of its digits is 725760, while the sum is 43.

The square root of 634256647 is about 25184.4524856110. The cubic root of 634256647 is about 859.1882763589.

The spelling of 634256647 in words is "six hundred thirty-four million, two hundred fifty-six thousand, six hundred forty-seven".