634243644 has 18 divisors (see below), whose sum is σ = 1603227080. Its totient is φ = 211414536.

The previous prime is 634243613. The next prime is 634243651. The reversal of 634243644 is 446342436.

634243644 is a `hidden beast` number, since 6 + 3 + 4 + 2 + 4 + 3 + 644 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17617879 = 634243644 / (6 + 3 + 4 + 2 + 4 + 3 + 6 + 4 + 4).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 634243599 and 634243608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8808904 + ... + 8808975.

Almost surely, 2^634243644 is an apocalyptic number.

It is an amenable number.

634243644 is an abundant number, since it is smaller than the sum of its proper divisors (968983436).

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

634243644 is a wasteful number, since it uses less digits than its factorization.

634243644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17617889 (or 17617884 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

The square root of 634243644 is about 25184.1943289834. The cubic root of 634243644 is about 859.1824048653.

The spelling of 634243644 in words is "six hundred thirty-four million, two hundred forty-three thousand, six hundred forty-four".