78738949269 has 6 divisors (see below), whose sum is σ = 113734037846. Its totient is φ = 52492632840.

The previous prime is 78738949241. The next prime is 78738949301. The reversal of 78738949269 is 96294983787.

78738949269 is a `hidden beast` number, since 7 + 8 + 73 + 8 + 9 + 492 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 78655007025 + 83942244 = 280455^2 + 9162^2 .

It is not a de Polignac number, because 78738949269 - 2⁸ = 78738949013 is a prime.

It is a super-2 number, since 2×78738949269² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78738949197 and 78738949206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78738949169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4374386062 + ... + 4374386079.

Almost surely, 2^78738949269 is an apocalyptic number.

It is an amenable number.

78738949269 is a deficient number, since it is larger than the sum of its proper divisors (34995088577).

78738949269 is a wasteful number, since it uses less digits than its factorization.

78738949269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8748772147 (or 8748772144 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 72.

The spelling of 78738949269 in words is "seventy-eight billion, seven hundred thirty-eight million, nine hundred forty-nine thousand, two hundred sixty-nine".