121658880 has 320 divisors, whose sum is σ = 465113088. Its totient is φ = 26542080.

The previous prime is 121658869. The next prime is 121658897. The reversal of 121658880 is 88856121.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1666524 + ... + 1666596.

Almost surely, 2^121658880 is an apocalyptic number.

121658880 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 121658880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232556544).

121658880 is an abundant number, since it is smaller than the sum of its proper divisors (343454208).

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

121658880 is an equidigital number, since it uses as much as digits as its factorization.

121658880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 121658880 is about 11029.9084311702. The cubic root of 121658880 is about 495.5048822715.

The spelling of 121658880 in words is "one hundred twenty-one million, six hundred fifty-eight thousand, eight hundred eighty".