109639780 has 12 divisors (see below), whose sum is σ = 230243580. Its totient is φ = 43855904.

The previous prime is 109639757. The next prime is 109639787. The reversal of 109639780 is 87936901.

It can be written as a sum of positive squares in 2 ways, for example, as 28387584 + 81252196 = 5328^2 + 9014^2 .

It is not an unprimeable number, because it can be changed into a prime (109639787) 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, 2740975 + ... + 2741014.

It is an arithmetic number, because the mean of its divisors is an integer number (19186965).

Almost surely, 2^109639780 is an apocalyptic number.

109639780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

109639780 is an abundant number, since it is smaller than the sum of its proper divisors (120603800).

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

109639780 is a wasteful number, since it uses less digits than its factorization.

109639780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481998 (or 5481996 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 109639780 is about 10470.9015848684. The cubic root of 109639780 is about 478.6183939736.

The spelling of 109639780 in words is "one hundred nine million, six hundred thirty-nine thousand, seven hundred eighty".