789778609 has 9 divisors (see below), whose sum is σ = 799306347. Its totient is φ = 780364104.

The previous prime is 789778601. The next prime is 789778621. The reversal of 789778609 is 906877987.

The square root of 789778609 is 28103.

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

It can be written as a sum of positive squares in only one way, i.e., 231496225 + 558282384 = 15215^2 + 23628^2 .

It is not a de Polignac number, because 789778609 - 2³ = 789778601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (789778601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4412082 + ... + 4412260.

Almost surely, 2^789778609 is an apocalyptic number.

789778609 is the 28103-rd square number.

789778609 is the 14052-nd centered octagonal number.

It is an amenable number.

789778609 is a deficient number, since it is larger than the sum of its proper divisors (9527738).

789778609 is an frugal number, since it uses more digits than its factorization.

789778609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 61.

The cubic root of 789778609 is about 924.3471835045.

The spelling of 789778609 in words is "seven hundred eighty-nine million, seven hundred seventy-eight thousand, six hundred nine".