78434623 has 16 divisors (see below), whose sum is σ = 85003776. Its totient is φ = 72182880.

The previous prime is 78434563. The next prime is 78434663. The reversal of 78434623 is 32643487.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78434623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78434663) 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, 69661 + ... + 70777.

It is an arithmetic number, because the mean of its divisors is an integer number (5312736).

Almost surely, 2^78434623 is an apocalyptic number.

78434623 is a deficient number, since it is larger than the sum of its proper divisors (6569153).

78434623 is a wasteful number, since it uses less digits than its factorization.

78434623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its digits is 96768, while the sum is 37.

The square root of 78434623 is about 8856.3323672952. The cubic root of 78434623 is about 428.0579866553.

The spelling of 78434623 in words is "seventy-eight million, four hundred thirty-four thousand, six hundred twenty-three".