634247680 has 160 divisors (see below), whose sum is σ = 1682892288. Its totient is φ = 227328000.

The previous prime is 634247651. The next prime is 634247681. The reversal of 634247680 is 86742436.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (634247681) by changing a digit.

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, 2844049 + ... + 2844271.

Almost surely, 2^634247680 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 634247680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841446144).

634247680 is an abundant number, since it is smaller than the sum of its proper divisors (1048644608).

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

634247680 is a wasteful number, since it uses less digits than its factorization.

634247680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 634247680 is about 25184.2744584790. The cubic root of 634247680 is about 859.1842273262.

The spelling of 634247680 in words is "six hundred thirty-four million, two hundred forty-seven thousand, six hundred eighty".