634660728 has 64 divisors (see below), whose sum is σ = 1809228960. Its totient is φ = 183791616.

The previous prime is 634660723. The next prime is 634660751. The reversal of 634660728 is 827066436.

634660728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 634660728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634660723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54525 + ... + 65132.

Almost surely, 2^634660728 is an apocalyptic number.

634660728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

634660728 is an abundant number, since it is smaller than the sum of its proper divisors (1174568232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634660728 is a wasteful number, since it uses less digits than its factorization.

634660728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119696 (or 119692 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 634660728 is about 25192.4736379737. The cubic root of 634660728 is about 859.3706988091.

The spelling of 634660728 in words is "six hundred thirty-four million, six hundred sixty thousand, seven hundred twenty-eight".