634421728 has 24 divisors (see below), whose sum is σ = 1251890640. Its totient is φ = 316481280.

The previous prime is 634421693. The next prime is 634421729. The reversal of 634421728 is 827124436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634421729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8533 + ... + 36628.

It is an arithmetic number, because the mean of its divisors is an integer number (52162110).

Almost surely, 2^634421728 is an apocalyptic number.

It is an amenable number.

634421728 is a deficient number, since it is larger than the sum of its proper divisors (617468912).

634421728 is a wasteful number, since it uses less digits than its factorization.

634421728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45610 (or 45602 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 634421728 is about 25187.7297111113. The cubic root of 634421728 is about 859.2628115684.

The spelling of 634421728 in words is "six hundred thirty-four million, four hundred twenty-one thousand, seven hundred twenty-eight".