634493886 has 64 divisors (see below), whose sum is σ = 1395007488. Its totient is φ = 191207808.

The previous prime is 634493837. The next prime is 634493891. The reversal of 634493886 is 688394436.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1656451 + ... + 1656833.

It is an arithmetic number, because the mean of its divisors is an integer number (21796992).

Almost surely, 2^634493886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634493886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (697503744).

634493886 is an abundant number, since it is smaller than the sum of its proper divisors (760513602).

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

634493886 is a wasteful number, since it uses less digits than its factorization.

634493886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785.

The product of its digits is 2985984, while the sum is 51.

The square root of 634493886 is about 25189.1620741937. The cubic root of 634493886 is about 859.2953873418.

The spelling of 634493886 in words is "six hundred thirty-four million, four hundred ninety-three thousand, eight hundred eighty-six".