247278 has 8 divisors (see below), whose sum is σ = 494568. Its totient is φ = 82424.

The previous prime is 247259. The next prime is 247279. The reversal of 247278 is 872742.

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

247278 is an admirable number.

It is a super-2 number, since 2×247278² = 122292818568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247279) by changing a digit.

247278 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 3 ways as a sum of consecutive naturals, for example, 20601 + ... + 20612.

It is an arithmetic number, because the mean of its divisors is an integer number (61821).

2²⁴⁷²⁷⁸ is an apocalyptic number.

247278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

247278 is a wasteful number, since it uses less digits than its factorization.

247278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41218.

The product of its digits is 6272, while the sum is 30.

The square root of 247278 is about 497.2705501033. The cubic root of 247278 is about 62.7665839777.

It can be divided in two parts, 247 and 278, that added together give a palindrome (525).

The spelling of 247278 in words is "two hundred forty-seven thousand, two hundred seventy-eight".