78427423 has 4 divisors (see below), whose sum is σ = 79308720. Its totient is φ = 77546128.

The previous prime is 78427417. The next prime is 78427429. The reversal of 78427423 is 32472487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32472487 = 1237 ⋅26251.

It is an interprime number because it is at equal distance from previous prime (78427417) and next prime (78427429).

It is a cyclic number.

It is not a de Polignac number, because 78427423 - 2²¹ = 76330271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427429) 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, 440515 + ... + 440692.

It is an arithmetic number, because the mean of its divisors is an integer number (19827180).

Almost surely, 2^78427423 is an apocalyptic number.

78427423 is a deficient number, since it is larger than the sum of its proper divisors (881297).

78427423 is an equidigital number, since it uses as much as digits as its factorization.

78427423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881296.

The product of its digits is 75264, while the sum is 37.

The square root of 78427423 is about 8855.9258691568. The cubic root of 78427423 is about 428.0448882230.

The spelling of 78427423 in words is "seventy-eight million, four hundred twenty-seven thousand, four hundred twenty-three".