108728639 has 4 divisors (see below), whose sum is σ = 111257256. Its totient is φ = 106200024.

The previous prime is 108728629. The next prime is 108728663. The reversal of 108728639 is 936827801.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 108728639 - 2¹² = 108724543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108728639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108728629) 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, 1264244 + ... + 1264329.

It is an arithmetic number, because the mean of its divisors is an integer number (27814314).

Almost surely, 2^108728639 is an apocalyptic number.

108728639 is a deficient number, since it is larger than the sum of its proper divisors (2528617).

108728639 is an equidigital number, since it uses as much as digits as its factorization.

108728639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528616.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 108728639 is about 10427.3025754507. The cubic root of 108728639 is about 477.2888812057.

The spelling of 108728639 in words is "one hundred eight million, seven hundred twenty-eight thousand, six hundred thirty-nine".