78841339369 has 9 divisors (see below), whose sum is σ = 85376527383. Its totient is φ = 72773251512.

The previous prime is 78841339349. The next prime is 78841339427. The reversal of 78841339369 is 96393314887.

The square root of 78841339369 is 280787.

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., 11662920025 + 67178419344 = 107995^2 + 259188^2 .

It is not a de Polignac number, because 78841339369 - 2¹¹ = 78841337321 is a prime.

It is a super-2 number, since 2×78841339369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78841339349) 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, 3639432 + ... + 3661030.

Almost surely, 2^78841339369 is an apocalyptic number.

78841339369 is the 280787-th square number.

78841339369 is the 140394-th centered octagonal number.

It is an amenable number.

78841339369 is a deficient number, since it is larger than the sum of its proper divisors (6535188014).

78841339369 is an frugal number, since it uses more digits than its factorization.

78841339369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43224 (or 21612 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 61.

The spelling of 78841339369 in words is "seventy-eight billion, eight hundred forty-one million, three hundred thirty-nine thousand, three hundred sixty-nine".