121728735 has 24 divisors (see below), whose sum is σ = 213093504. Its totient is φ = 64276800.

The previous prime is 121728727. The next prime is 121728793. The reversal of 121728735 is 537827121.

It is not a de Polignac number, because 121728735 - 2³ = 121728727 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 121728735.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8847 + ... + 17936.

It is an arithmetic number, because the mean of its divisors is an integer number (8878896).

Almost surely, 2^121728735 is an apocalyptic number.

121728735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121728735 is a deficient number, since it is larger than the sum of its proper divisors (91364769).

121728735 is a wasteful number, since it uses less digits than its factorization.

121728735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26895 (or 26892 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 121728735 is about 11033.0745941465. The cubic root of 121728735 is about 495.5997016846.

The spelling of 121728735 in words is "one hundred twenty-one million, seven hundred twenty-eight thousand, seven hundred thirty-five".