634428507 has 4 divisors (see below), whose sum is σ = 845904680. Its totient is φ = 422952336.

The previous prime is 634428499. The next prime is 634428581. The reversal of 634428507 is 705824436.

It is a happy number.

634428507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 634428507 - 2³ = 634428499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634428007) 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, 105738082 + ... + 105738087.

It is an arithmetic number, because the mean of its divisors is an integer number (211476170).

Almost surely, 2^634428507 is an apocalyptic number.

634428507 is a deficient number, since it is larger than the sum of its proper divisors (211476173).

634428507 is a wasteful number, since it uses less digits than its factorization.

634428507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211476172.

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 634428507 is about 25187.8642802442. The cubic root of 634428507 is about 859.2658720572.

The spelling of 634428507 in words is "six hundred thirty-four million, four hundred twenty-eight thousand, five hundred seven".