109178820 has 48 divisors (see below), whose sum is σ = 339669120. Its totient is φ = 29114208.

The previous prime is 109178813. The next prime is 109178821. The reversal of 109178820 is 28871901.

109178820 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

109178820 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (109178821) 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, 100552 + ... + 101631.

It is an arithmetic number, because the mean of its divisors is an integer number (7076440).

Almost surely, 2^109178820 is an apocalyptic number.

109178820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

109178820 is an abundant number, since it is smaller than the sum of its proper divisors (230490300).

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

109178820 is a wasteful number, since it uses less digits than its factorization.

109178820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202201 (or 202193 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 109178820 is about 10448.8669242172. The cubic root of 109178820 is about 477.9466978373.

It can be divided in two parts, 109 and 178820, that added together give a square (178929 = 423²).

The spelling of 109178820 in words is "one hundred nine million, one hundred seventy-eight thousand, eight hundred twenty".