634307720 has 64 divisors (see below), whose sum is σ = 1512529200. Its totient is φ = 238981120.

The previous prime is 634307677. The next prime is 634307741. The reversal of 634307720 is 27703436.

It can be written as a sum of positive squares in 8 ways, for example, as 67010596 + 567297124 = 8186^2 + 23818^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40892 + ... + 54228.

Almost surely, 2^634307720 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 634307720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756264600).

634307720 is an abundant number, since it is smaller than the sum of its proper divisors (878221480).

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

634307720 is a wasteful number, since it uses less digits than its factorization.

634307720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13418 (or 13414 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 32.

The square root of 634307720 is about 25185.4664439633. The cubic root of 634307720 is about 859.2113375520.

The spelling of 634307720 in words is "six hundred thirty-four million, three hundred seven thousand, seven hundred twenty".