78278793 has 8 divisors (see below), whose sum is σ = 105544800. Its totient is φ = 51599328.

The previous prime is 78278779. The next prime is 78278797. The reversal of 78278793 is 39787287.

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

It is not a de Polignac number, because 78278793 - 2⁴ = 78278777 is a prime.

It is a super-2 number, since 2×78278793² = 12255138867073698, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78278797) 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 7 ways as a sum of consecutive naturals, for example, 146323 + ... + 146856.

It is an arithmetic number, because the mean of its divisors is an integer number (13193100).

Almost surely, 2^78278793 is an apocalyptic number.

It is an amenable number.

78278793 is a deficient number, since it is larger than the sum of its proper divisors (27266007).

78278793 is a wasteful number, since it uses less digits than its factorization.

78278793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293271.

The product of its digits is 1185408, while the sum is 51.

The square root of 78278793 is about 8847.5303333755. The cubic root of 78278793 is about 427.7743172874.

The spelling of 78278793 in words is "seventy-eight million, two hundred seventy-eight thousand, seven hundred ninety-three".