121728896 has 32 divisors (see below), whose sum is σ = 255275400. Its totient is φ = 57659904.

The previous prime is 121728881. The next prime is 121728899. The reversal of 121728896 is 698827121.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121728899) 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, 22595 + ... + 27458.

Almost surely, 2^121728896 is an apocalyptic number.

121728896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121728896 is an abundant number, since it is smaller than the sum of its proper divisors (133546504).

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

121728896 is an equidigital number, since it uses as much as digits as its factorization.

121728896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50086 (or 50074 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 121728896 is about 11033.0818903877. The cubic root of 121728896 is about 495.5999201800.

The spelling of 121728896 in words is "one hundred twenty-one million, seven hundred twenty-eight thousand, eight hundred ninety-six".