78843969 has 16 divisors (see below), whose sum is σ = 117006400. Its totient is φ = 52472448.

The previous prime is 78843917. The next prime is 78843979. The reversal of 78843969 is 96934887.

It is not a de Polignac number, because 78843969 - 2¹⁶ = 78778433 is a prime.

It is a super-2 number, since 2×78843969² = 12432742895345922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78843979) 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, 16002 + ... + 20340.

It is an arithmetic number, because the mean of its divisors is an integer number (7312900).

Almost surely, 2^78843969 is an apocalyptic number.

It is an amenable number.

78843969 is a deficient number, since it is larger than the sum of its proper divisors (38162431).

78843969 is a wasteful number, since it uses less digits than its factorization.

78843969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5021 (or 5015 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 78843969 is about 8879.4126494943. The cubic root of 78843969 is about 428.8013653268.

The spelling of 78843969 in words is "seventy-eight million, eight hundred forty-three thousand, nine hundred sixty-nine".