78442367 has 4 divisors (see below), whose sum is σ = 78768096. Its totient is φ = 78116640.

The previous prime is 78442337. The next prime is 78442373. The reversal of 78442367 is 76324487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76324487 = 1181 ⋅64627.

It is a cyclic number.

It is not a de Polignac number, because 78442367 - 2¹⁰ = 78441343 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 (78442337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162503 + ... + 162984.

It is an arithmetic number, because the mean of its divisors is an integer number (19692024).

Almost surely, 2^78442367 is an apocalyptic number.

78442367 is a deficient number, since it is larger than the sum of its proper divisors (325729).

78442367 is a wasteful number, since it uses less digits than its factorization.

78442367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325728.

The product of its digits is 225792, while the sum is 41.

The square root of 78442367 is about 8856.7695578015. The cubic root of 78442367 is about 428.0720738524.

The spelling of 78442367 in words is "seventy-eight million, four hundred forty-two thousand, three hundred sixty-seven".