634429136 has 80 divisors (see below), whose sum is σ = 1397101056. Its totient is φ = 279074400.

The previous prime is 634429129. The next prime is 634429139. The reversal of 634429136 is 631924436.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a self number, because there is not a number n which added to its sum of digits gives 634429136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634429139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20465441 + ... + 20465471.

Almost surely, 2^634429136 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 634429136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698550528).

634429136 is an abundant number, since it is smaller than the sum of its proper divisors (762671920).

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

634429136 is an frugal number, since it uses more digits than its factorization.

634429136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 44 counting only the distinct ones).

The product of its digits is 93312, while the sum is 38.

The square root of 634429136 is about 25187.8767664128. The cubic root of 634429136 is about 859.2661560283.

The spelling of 634429136 in words is "six hundred thirty-four million, four hundred twenty-nine thousand, one hundred thirty-six".