634221798 has 48 divisors (see below), whose sum is σ = 1500586560. Its totient is φ = 178130064.

The previous prime is 634221787. The next prime is 634221811. The reversal of 634221798 is 897122436.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 936 + ... + 35627.

It is an arithmetic number, because the mean of its divisors is an integer number (31262220).

Almost surely, 2^634221798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634221798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750293280).

634221798 is an abundant number, since it is smaller than the sum of its proper divisors (866364762).

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

634221798 is a wasteful number, since it uses less digits than its factorization.

634221798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36641 (or 36634 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 634221798 is about 25183.7606008316. The cubic root of 634221798 is about 859.1725401419.

The spelling of 634221798 in words is "six hundred thirty-four million, two hundred twenty-one thousand, seven hundred ninety-eight".