78239267 has 4 divisors (see below), whose sum is σ = 78333360. Its totient is φ = 78145176.

The previous prime is 78239243. The next prime is 78239297. The reversal of 78239267 is 76293287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78239267 - 2¹⁴ = 78222883 is a prime.

It is a super-2 number, since 2×78239267² = 12242765801394578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78239237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45788 + ... + 47465.

It is an arithmetic number, because the mean of its divisors is an integer number (19583340).

Almost surely, 2^78239267 is an apocalyptic number.

78239267 is a deficient number, since it is larger than the sum of its proper divisors (94093).

78239267 is an equidigital number, since it uses as much as digits as its factorization.

78239267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94092.

The product of its digits is 254016, while the sum is 44.

The square root of 78239267 is about 8845.2963206441. The cubic root of 78239267 is about 427.7023052150.

The spelling of 78239267 in words is "seventy-eight million, two hundred thirty-nine thousand, two hundred sixty-seven".