789216649 has 9 divisors (see below), whose sum is σ = 854991189. Its totient is φ = 728170560.

The previous prime is 789216647. The next prime is 789216683. The reversal of 789216649 is 946612987.

It is a happy number.

The square root of 789216649 is 28093.

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

It can be written as a sum of positive squares in 4 ways, for example, as 53071225 + 736145424 = 7285^2 + 27132^2 .

It is not a de Polignac number, because 789216649 - 2¹ = 789216647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 789216596 and 789216605.

It is not an unprimeable number, because it can be changed into a prime (789216647) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 364129 + ... + 366289.

It is an arithmetic number, because the mean of its divisors is an integer number (94999021).

Almost surely, 2^789216649 is an apocalyptic number.

789216649 is the 28093-rd square number.

789216649 is the 14047-th centered octagonal number.

It is an amenable number.

789216649 is a deficient number, since it is larger than the sum of its proper divisors (65774540).

789216649 is an frugal number, since it uses more digits than its factorization.

789216649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348 (or 2174 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The cubic root of 789216649 is about 924.1278944580.

The spelling of 789216649 in words is "seven hundred eighty-nine million, two hundred sixteen thousand, six hundred forty-nine".