121204728 has 64 divisors (see below), whose sum is σ = 343872000. Its totient is φ = 39538656.

The previous prime is 121204709. The next prime is 121204729. The reversal of 121204728 is 827402121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121204729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4183 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (5373000).

Almost surely, 2^121204728 is an apocalyptic number.

121204728 is a gapful number since it is divisible by the number (18) 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 121204728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171936000).

121204728 is an abundant number, since it is smaller than the sum of its proper divisors (222667272).

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

121204728 is a wasteful number, since it uses less digits than its factorization.

121204728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12001 (or 11991 counting only the distinct ones).

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

The square root of 121204728 is about 11009.3018852241. The cubic root of 121204728 is about 494.8875410272.

Adding to 121204728 its reverse (827402121), we get a palindrome (948606849).

The spelling of 121204728 in words is "one hundred twenty-one million, two hundred four thousand, seven hundred twenty-eight".