121616784 has 45 divisors (see below), whose sum is σ = 340728843. Its totient is φ = 40494816.

The previous prime is 121616773. The next prime is 121616797. The reversal of 121616784 is 487616121.

It is a happy number.

The square root of 121616784 is 11028.

It is a perfect power (a square), and thus also a powerful number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 131877 + ... + 132795.

Almost surely, 2^121616784 is an apocalyptic number.

121616784 is the 11028-th square number.

It is an amenable number.

121616784 is an abundant number, since it is smaller than the sum of its proper divisors (219112059).

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

121616784 is an frugal number, since it uses more digits than its factorization.

121616784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852 (or 924 counting only the distinct ones).

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

The cubic root of 121616784 is about 495.4477246961.

Multiplying 121616784 by its sum of digits (36), we get a square (4378204224 = 66168²).

121616784 divided by its sum of digits (36) gives a square (3378244 = 1838²).

The spelling of 121616784 in words is "one hundred twenty-one million, six hundred sixteen thousand, seven hundred eighty-four".