108021640 has 16 divisors (see below), whose sum is σ = 243048780. Its totient is φ = 43208640.

The previous prime is 108021637. The next prime is 108021647. The reversal of 108021640 is 46120801.

It can be written as a sum of positive squares in 2 ways, for example, as 105390756 + 2630884 = 10266^2 + 1622^2 .

It is not an unprimeable number, because it can be changed into a prime (108021647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350231 + ... + 1350310.

Almost surely, 2^108021640 is an apocalyptic number.

108021640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

108021640 is an abundant number, since it is smaller than the sum of its proper divisors (135027140).

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

108021640 is a wasteful number, since it uses less digits than its factorization.

108021640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700552 (or 2700548 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 108021640 is about 10393.3459482498. The cubic root of 108021640 is about 476.2521202800.

The spelling of 108021640 in words is "one hundred eight million, twenty-one thousand, six hundred forty".