634152021228 has 144 divisors (see below), whose sum is σ = 1798374928896. Its totient is φ = 186778750080.

The previous prime is 634152021227. The next prime is 634152021257. The reversal of 634152021228 is 822120251436.

634152021228 is a `hidden beast` number, since 6 + 3 + 4 + 1 + 520 + 2 + 122 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 634152021192 and 634152021201.

It is not an unprimeable number, because it can be changed into a prime (634152021227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2104525 + ... + 2386907.

It is an arithmetic number, because the mean of its divisors is an integer number (12488714784).

Almost surely, 2^634152021228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634152021228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899187464448).

634152021228 is an abundant number, since it is smaller than the sum of its proper divisors (1164222907668).

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

634152021228 is a wasteful number, since it uses less digits than its factorization.

634152021228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282564 (or 282559 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 634152021228 in words is "six hundred thirty-four billion, one hundred fifty-two million, twenty-one thousand, two hundred twenty-eight".