121728108 has 24 divisors (see below), whose sum is σ = 284336640. Its totient is φ = 40532560.

The previous prime is 121728097. The next prime is 121728127. The reversal of 121728108 is 801827121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7453 + ... + 17291.

It is an arithmetic number, because the mean of its divisors is an integer number (11847360).

Almost surely, 2^121728108 is an apocalyptic number.

It is an amenable number.

121728108 is an abundant number, since it is smaller than the sum of its proper divisors (162608532).

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

121728108 is a wasteful number, since it uses less digits than its factorization.

121728108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10877 (or 10875 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 121728108 is about 11033.0461795462. The cubic root of 121728108 is about 495.5988507720.

The spelling of 121728108 in words is "one hundred twenty-one million, seven hundred twenty-eight thousand, one hundred eight".