108639564 has 48 divisors (see below), whose sum is σ = 277648896. Its totient is φ = 32788800.

The previous prime is 108639551. The next prime is 108639569. The reversal of 108639564 is 465936801.

It is a super-2 number, since 2×108639564² = 23605109732220192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (108639569) 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, 34254 + ... + 37290.

It is an arithmetic number, because the mean of its divisors is an integer number (5784352).

Almost surely, 2^108639564 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 108639564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138824448).

108639564 is an abundant number, since it is smaller than the sum of its proper divisors (169009332).

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

108639564 is a wasteful number, since it uses less digits than its factorization.

108639564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326 (or 3324 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 108639564 is about 10423.0304614349. The cubic root of 108639564 is about 477.1585073298.

The spelling of 108639564 in words is "one hundred eight million, six hundred thirty-nine thousand, five hundred sixty-four".