78047 has 4 divisors (see below), whose sum is σ = 82656. Its totient is φ = 73440.

The previous prime is 78041. The next prime is 78049. The reversal of 78047 is 74087.

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

It is not a de Polignac number, because 78047 - 2⁴ = 78031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279 + ... + 2312.

It is an arithmetic number, because the mean of its divisors is an integer number (20664).

2⁷⁸⁰⁴⁷ is an apocalyptic number.

78047 is a deficient number, since it is larger than the sum of its proper divisors (4609).

78047 is a wasteful number, since it uses less digits than its factorization.

78047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 78047 is about 279.3689317014. The cubic root of 78047 is about 42.7351669297.

The spelling of 78047 in words is "seventy-eight thousand, forty-seven".