105611988 has 12 divisors (see below), whose sum is σ = 246428000. Its totient is φ = 35203992.

The previous prime is 105611983. The next prime is 105612011. The reversal of 105611988 is 889116501.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×105611988² = 22307784018624288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105611983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4400488 + ... + 4400511.

Almost surely, 2^105611988 is an apocalyptic number.

It is an amenable number.

105611988 is an abundant number, since it is smaller than the sum of its proper divisors (140816012).

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

105611988 is a wasteful number, since it uses less digits than its factorization.

105611988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8801006 (or 8801004 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 39.

The square root of 105611988 is about 10276.7693367128. The cubic root of 105611988 is about 472.6841856327.

The spelling of 105611988 in words is "one hundred five million, six hundred eleven thousand, nine hundred eighty-eight".