121783680 has 96 divisors (see below), whose sum is σ = 420554160. Its totient is φ = 32474112.

The previous prime is 121783621. The next prime is 121783693. The reversal of 121783680 is 86387121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4812 + ... + 16331.

Almost surely, 2^121783680 is an apocalyptic number.

121783680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121783680 is an abundant number, since it is smaller than the sum of its proper divisors (298770480).

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

121783680 is a wasteful number, since it uses less digits than its factorization.

121783680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21168 (or 21153 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 121783680 is about 11035.5643263043. The cubic root of 121783680 is about 495.6742571557.

The spelling of 121783680 in words is "one hundred twenty-one million, seven hundred eighty-three thousand, six hundred eighty".