1020784689 has 12 divisors (see below), whose sum is σ = 1538574336. Its totient is φ = 650935032.

The previous prime is 1020784657. The next prime is 1020784691. The reversal of 1020784689 is 9864870201.

It is not a de Polignac number, because 1020784689 - 2⁵ = 1020784657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020784649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2465457 + ... + 2465870.

It is an arithmetic number, because the mean of its divisors is an integer number (128214528).

Almost surely, 2^1020784689 is an apocalyptic number.

It is an amenable number.

1020784689 is a deficient number, since it is larger than the sum of its proper divisors (517789647).

1020784689 is a wasteful number, since it uses less digits than its factorization.

1020784689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931356 (or 4931353 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1020784689 is about 31949.7212663898. The cubic root of 1020784689 is about 1006.8807759980.

The spelling of 1020784689 in words is "one billion, twenty million, seven hundred eighty-four thousand, six hundred eighty-nine".