634428917 has 4 divisors (see below), whose sum is σ = 636011436. Its totient is φ = 632846400.

The previous prime is 634428913. The next prime is 634428929. The reversal of 634428917 is 719824436.

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 404572996 + 229855921 = 20114^2 + 15161^2 .

It is a cyclic number.

It is not a de Polignac number, because 634428917 - 2² = 634428913 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 (634428913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790658 + ... + 791459.

It is an arithmetic number, because the mean of its divisors is an integer number (159002859).

Almost surely, 2^634428917 is an apocalyptic number.

It is an amenable number.

634428917 is a deficient number, since it is larger than the sum of its proper divisors (1582519).

634428917 is a wasteful number, since it uses less digits than its factorization.

634428917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582518.

The product of its digits is 290304, while the sum is 44.

The square root of 634428917 is about 25187.8724190830. The cubic root of 634428917 is about 859.2660571576.

The spelling of 634428917 in words is "six hundred thirty-four million, four hundred twenty-eight thousand, nine hundred seventeen".