9780218889 has 16 divisors (see below), whose sum is σ = 14906035200. Its totient is φ = 5587629840.

The previous prime is 9780218869. The next prime is 9780218963. The reversal of 9780218889 is 9888120879.

9780218889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9780218889 - 2¹⁷ = 9780087817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9780218869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75762 + ... + 159060.

It is an arithmetic number, because the mean of its divisors is an integer number (931627200).

Almost surely, 2^9780218889 is an apocalyptic number.

It is an amenable number.

9780218889 is a deficient number, since it is larger than the sum of its proper divisors (5125816311).

9780218889 is a wasteful number, since it uses less digits than its factorization.

9780218889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88900.

The product of its (nonzero) digits is 4644864, while the sum is 60.

The square root of 9780218889 is about 98894.9892006668. The cubic root of 9780218889 is about 2138.5341585548.

The spelling of 9780218889 in words is "nine billion, seven hundred eighty million, two hundred eighteen thousand, eight hundred eighty-nine".