78494969 has 4 divisors (see below), whose sum is σ = 89708544. Its totient is φ = 67281396.

The previous prime is 78494963. The next prime is 78494971. The reversal of 78494969 is 96949487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96949487 = 17 ⋅5702911.

It is not a de Polignac number, because 78494969 - 2²⁴ = 61717753 is a prime.

It is a super-2 number, since 2×78494969² = 12322920316621922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78494963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5606777 + ... + 5606790.

It is an arithmetic number, because the mean of its divisors is an integer number (22427136).

Almost surely, 2^78494969 is an apocalyptic number.

It is an amenable number.

78494969 is a deficient number, since it is larger than the sum of its proper divisors (11213575).

78494969 is a wasteful number, since it uses less digits than its factorization.

78494969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11213574.

The product of its digits is 3919104, while the sum is 56.

The square root of 78494969 is about 8859.7386530303. The cubic root of 78494969 is about 428.1677382095.

The spelling of 78494969 in words is "seventy-eight million, four hundred ninety-four thousand, nine hundred sixty-nine".