634561290 has 160 divisors (see below), whose sum is σ = 1875519360. Its totient is φ = 152668800.

The previous prime is 634561171. The next prime is 634561303. The reversal of 634561290 is 92165436.

It is a happy number.

634561290 is a `hidden beast` number, since 6 + 3 + 4 + 561 + 2 + 90 = 666.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

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 79 ways as a sum of consecutive naturals, for example, 2040235 + ... + 2040545.

It is an arithmetic number, because the mean of its divisors is an integer number (11721996).

Almost surely, 2^634561290 is an apocalyptic number.

It is a pronic number, being equal to 25190×25191.

It is a practical number, because each smaller number is the sum of distinct divisors of 634561290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (937759680).

634561290 is an abundant number, since it is smaller than the sum of its proper divisors (1240958070).

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

634561290 is a wasteful number, since it uses less digits than its factorization.

634561290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 634561290 is about 25190.4999950378. The cubic root of 634561290 is about 859.3258146880.

It can be divided in two parts, 63456 and 1290, that added together give a palindrome (64746).

The spelling of 634561290 in words is "six hundred thirty-four million, five hundred sixty-one thousand, two hundred ninety".