78280672769 has 16 divisors (see below), whose sum is σ = 90264177360. Its totient is φ = 67244390400.

The previous prime is 78280672751. The next prime is 78280672787. The reversal of 78280672769 is 96727608287.

It is an interprime number because it is at equal distance from previous prime (78280672751) and next prime (78280672787).

It can be written as a sum of positive squares in 8 ways, for example, as 19371072400 + 58909600369 = 139180^2 + 242713^2 .

It is a cyclic number.

It is not a de Polignac number, because 78280672769 - 2³⁶ = 9561196033 is a prime.

It is a super-2 number, since 2×78280672769² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78280672069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1970282 + ... + 2009619.

It is an arithmetic number, because the mean of its divisors is an integer number (5641511085).

Almost surely, 2^78280672769 is an apocalyptic number.

It is an amenable number.

78280672769 is a deficient number, since it is larger than the sum of its proper divisors (11983504591).

78280672769 is a wasteful number, since it uses less digits than its factorization.

78280672769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980020.

The product of its (nonzero) digits is 28449792, while the sum is 62.

The spelling of 78280672769 in words is "seventy-eight billion, two hundred eighty million, six hundred seventy-two thousand, seven hundred sixty-nine".