78436469 has 4 divisors (see below), whose sum is σ = 79541280. Its totient is φ = 77331660.

The previous prime is 78436451. The next prime is 78436471. The reversal of 78436469 is 96463487.

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: 96463487 = 3613 ⋅26699.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78436469 is a prime.

It is a super-2 number, since 2×78436469² = 12304559338375922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78436439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552299 + ... + 552440.

It is an arithmetic number, because the mean of its divisors is an integer number (19885320).

Almost surely, 2^78436469 is an apocalyptic number.

It is an amenable number.

78436469 is a deficient number, since it is larger than the sum of its proper divisors (1104811).

78436469 is a wasteful number, since it uses less digits than its factorization.

78436469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104810.

The product of its digits is 870912, while the sum is 47.

The square root of 78436469 is about 8856.4365858962. The cubic root of 78436469 is about 428.0613448188.

The spelling of 78436469 in words is "seventy-eight million, four hundred thirty-six thousand, four hundred sixty-nine".