109643856 has 160 divisors (see below), whose sum is σ = 339406848. Its totient is φ = 29852160.

The previous prime is 109643843. The next prime is 109643873. The reversal of 109643856 is 658346901.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 836911 + ... + 837041.

Almost surely, 2^109643856 is an apocalyptic number.

109643856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 109643856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169703424).

109643856 is an abundant number, since it is smaller than the sum of its proper divisors (229762992).

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

109643856 is a wasteful number, since it uses less digits than its factorization.

109643856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 243 counting only the distinct ones).

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

The square root of 109643856 is about 10471.0962176842. The cubic root of 109643856 is about 478.6243249851.

The spelling of 109643856 in words is "one hundred nine million, six hundred forty-three thousand, eight hundred fifty-six".