121788560 has 20 divisors (see below), whose sum is σ = 283158588. Its totient is φ = 48715392.

The previous prime is 121788529. The next prime is 121788581. The reversal of 121788560 is 65887121.

It can be written as a sum of positive squares in 2 ways, for example, as 69022864 + 52765696 = 8308^2 + 7264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761099 + ... + 761258.

Almost surely, 2^121788560 is an apocalyptic number.

121788560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121788560 is an abundant number, since it is smaller than the sum of its proper divisors (161370028).

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

121788560 is a wasteful number, since it uses less digits than its factorization.

121788560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522370 (or 1522364 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 121788560 is about 11035.7854274175. The cubic root of 121788560 is about 495.6808777967.

The spelling of 121788560 in words is "one hundred twenty-one million, seven hundred eighty-eight thousand, five hundred sixty".