278747 has 4 divisors (see below), whose sum is σ = 318576. Its totient is φ = 238920.

The previous prime is 278743. The next prime is 278753. The reversal of 278747 is 747872.

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

It is a cyclic number.

It is not a de Polignac number, because 278747 - 2² = 278743 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278747.

It is not an unprimeable number, because it can be changed into a prime (278741) 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, 19904 + ... + 19917.

It is an arithmetic number, because the mean of its divisors is an integer number (79644).

2²⁷⁸⁷⁴⁷ is an apocalyptic number.

278747 is a deficient number, since it is larger than the sum of its proper divisors (39829).

278747 is an equidigital number, since it uses as much as digits as its factorization.

278747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39828.

The product of its digits is 21952, while the sum is 35.

The square root of 278747 is about 527.9649609586. The cubic root of 278747 is about 65.3235934622.

The spelling of 278747 in words is "two hundred seventy-eight thousand, seven hundred forty-seven".