109278428 has 48 divisors (see below), whose sum is σ = 232780800. Its totient is φ = 44784432.

The previous prime is 109278419. The next prime is 109278457. The reversal of 109278428 is 824872901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29825 + ... + 33287.

It is an arithmetic number, because the mean of its divisors is an integer number (4849600).

Almost surely, 2^109278428 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 109278428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116390400).

109278428 is an abundant number, since it is smaller than the sum of its proper divisors (123502372).

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

109278428 is a wasteful number, since it uses less digits than its factorization.

109278428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3511 (or 3495 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 109278428 is about 10453.6322873918. The cubic root of 109278428 is about 478.0920033218.

The spelling of 109278428 in words is "one hundred nine million, two hundred seventy-eight thousand, four hundred twenty-eight".