78236393 has 8 divisors (see below), whose sum is σ = 80275008. Its totient is φ = 76207824.

The previous prime is 78236371. The next prime is 78236399. The reversal of 78236393 is 39363287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78236393 - 2¹⁸ = 77974249 is a prime.

It is a super-2 number, since 2×78236393² = 12241866379300898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78236393.

It is not an unprimeable number, because it can be changed into a prime (78236399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14780 + ... + 19362.

It is an arithmetic number, because the mean of its divisors is an integer number (10034376).

Almost surely, 2^78236393 is an apocalyptic number.

It is an amenable number.

78236393 is a deficient number, since it is larger than the sum of its proper divisors (2038615).

78236393 is a wasteful number, since it uses less digits than its factorization.

78236393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5023.

The product of its digits is 163296, while the sum is 41.

The square root of 78236393 is about 8845.1338599255. The cubic root of 78236393 is about 427.6970681538.

The spelling of 78236393 in words is "seventy-eight million, two hundred thirty-six thousand, three hundred ninety-three".