634653828 has 18 divisors (see below), whose sum is σ = 1604263934. Its totient is φ = 211551264.

The previous prime is 634653823. The next prime is 634653829. The reversal of 634653828 is 828356436.

It is a happy number.

634653828 is a `hidden beast` number, since 634 + 6 + 5 + 3 + 8 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 625400064 + 9253764 = 25008^2 + 3042^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (634653823) 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 5 ways as a sum of consecutive naturals, for example, 8814601 + ... + 8814672.

Almost surely, 2^634653828 is an apocalyptic number.

It is an amenable number.

634653828 is an abundant number, since it is smaller than the sum of its proper divisors (969610106).

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

634653828 is a wasteful number, since it uses less digits than its factorization.

634653828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17629283 (or 17629278 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 634653828 is about 25192.3366919387. The cubic root of 634653828 is about 859.3675844526.

The spelling of 634653828 in words is "six hundred thirty-four million, six hundred fifty-three thousand, eight hundred twenty-eight".