121606728 has 32 divisors (see below), whose sum is σ = 305847360. Its totient is φ = 40291520.

The previous prime is 121606699. The next prime is 121606747. The reversal of 121606728 is 827606121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11163 + ... + 19178.

It is an arithmetic number, because the mean of its divisors is an integer number (9557730).

Almost surely, 2^121606728 is an apocalyptic number.

It is an amenable number.

121606728 is an abundant number, since it is smaller than the sum of its proper divisors (184240632).

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

121606728 is a wasteful number, since it uses less digits than its factorization.

121606728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30517 (or 30513 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 121606728 is about 11027.5440602158. The cubic root of 121606728 is about 495.4340687969.

The spelling of 121606728 in words is "one hundred twenty-one million, six hundred six thousand, seven hundred twenty-eight".