78123847 has 8 divisors (see below), whose sum is σ = 82903680. Its totient is φ = 73459320.

The previous prime is 78123827. The next prime is 78123863. The reversal of 78123847 is 74832187.

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 78123847 - 2⁷ = 78123719 is a prime.

It is a super-2 number, since 2×78123847² = 12206670940158818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78123827) 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, 27429 + ... + 30142.

It is an arithmetic number, because the mean of its divisors is an integer number (10362960).

Almost surely, 2^78123847 is an apocalyptic number.

78123847 is a deficient number, since it is larger than the sum of its proper divisors (4779833).

78123847 is a wasteful number, since it uses less digits than its factorization.

78123847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57653.

The product of its digits is 75264, while the sum is 40.

The square root of 78123847 is about 8838.7695410617. The cubic root of 78123847 is about 427.4918836164.

The spelling of 78123847 in words is "seventy-eight million, one hundred twenty-three thousand, eight hundred forty-seven".