78678233 has 4 divisors (see below), whose sum is σ = 79674240. Its totient is φ = 77682228.

The previous prime is 78678203. The next prime is 78678241. The reversal of 78678233 is 33287687.

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: 33287687 = 2909 ⋅11443.

It is a cyclic number.

It is not a de Polignac number, because 78678233 - 2¹² = 78674137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78678203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497885 + ... + 498042.

It is an arithmetic number, because the mean of its divisors is an integer number (19918560).

Almost surely, 2^78678233 is an apocalyptic number.

It is an amenable number.

78678233 is a deficient number, since it is larger than the sum of its proper divisors (996007).

78678233 is an equidigital number, since it uses as much as digits as its factorization.

78678233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996006.

The product of its digits is 338688, while the sum is 44.

The square root of 78678233 is about 8870.0751406062. The cubic root of 78678233 is about 428.5006968932.

The spelling of 78678233 in words is "seventy-eight million, six hundred seventy-eight thousand, two hundred thirty-three".