121428720 has 200 divisors, whose sum is σ = 482168544. Its totient is φ = 27744768.

The previous prime is 121428701. The next prime is 121428731. The reversal of 121428720 is 27824121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44022 + ... + 46698.

Almost surely, 2^121428720 is an apocalyptic number.

121428720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121428720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241084272).

121428720 is an abundant number, since it is smaller than the sum of its proper divisors (360739824).

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

121428720 is a wasteful number, since it uses less digits than its factorization.

121428720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709 (or 2694 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 121428720 is about 11019.4700417035. The cubic root of 121428720 is about 495.1922118546.

The spelling of 121428720 in words is "one hundred twenty-one million, four hundred twenty-eight thousand, seven hundred twenty".