247878 has 24 divisors (see below), whose sum is σ = 550368. Its totient is φ = 80592.

The previous prime is 247873. The next prime is 247879. The reversal of 247878 is 878742.

It is a super-2 number, since 2×247878² = 122887005768, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247873) by changing a digit.

247878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 700 + ... + 992.

It is an arithmetic number, because the mean of its divisors is an integer number (22932).

2²⁴⁷⁸⁷⁸ is an apocalyptic number.

247878 is an abundant number, since it is smaller than the sum of its proper divisors (302490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247878 is a wasteful number, since it uses less digits than its factorization.

247878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 345 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 247878 is about 497.8734779038. The cubic root of 247878 is about 62.8173089806.

It can be divided in two parts, 2478 and 78, that added together give a triangular number (2556 = T₇₁).

The spelling of 247878 in words is "two hundred forty-seven thousand, eight hundred seventy-eight".