1220864589 has 64 divisors (see below), whose sum is σ = 2193817600. Its totient is φ = 655470144.

The previous prime is 1220864573. The next prime is 1220864597. The reversal of 1220864589 is 9854680221.

1220864589 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 8 + 64 + 589 = 666.

It is not a de Polignac number, because 1220864589 - 2⁴ = 1220864573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220864569) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 454719 + ... + 457395.

It is an arithmetic number, because the mean of its divisors is an integer number (34278400).

Almost surely, 2^1220864589 is an apocalyptic number.

1220864589 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1220864589 is a deficient number, since it is larger than the sum of its proper divisors (972953011).

1220864589 is a wasteful number, since it uses less digits than its factorization.

1220864589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2833 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1220864589 is about 34940.8727567014. The cubic root of 1220864589 is about 1068.7820855864.

The spelling of 1220864589 in words is "one billion, two hundred twenty million, eight hundred sixty-four thousand, five hundred eighty-nine".