78239362369 has 27 divisors (see below), whose sum is σ = 94116765411. Its totient is φ = 64848661920.

The previous prime is 78239362367. The next prime is 78239362373. The reversal of 78239362369 is 96326393287.

The square root of 78239362369 is 279713.

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., 63472251969 + 14767110400 = 251937^2 + 121520^2 .

It is not a de Polignac number, because 78239362369 - 2¹ = 78239362367 is a prime.

It is a super-2 number, since 2×78239362369² (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 (78239362367) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 60697077 + ... + 60698365.

Almost surely, 2^78239362369 is an apocalyptic number.

78239362369 is the 279713-rd square number.

78239362369 is the 139857-th centered octagonal number.

It is an amenable number.

78239362369 is a deficient number, since it is larger than the sum of its proper divisors (15877403042).

78239362369 is an frugal number, since it uses more digits than its factorization.

78239362369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 1327 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 58.

The spelling of 78239362369 in words is "seventy-eight billion, two hundred thirty-nine million, three hundred sixty-two thousand, three hundred sixty-nine".