278463 has 4 divisors (see below), whose sum is σ = 371288. Its totient is φ = 185640.

The previous prime is 278459. The next prime is 278479. The reversal of 278463 is 364872.

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

It is not a de Polignac number, because 278463 - 2² = 278459 is a prime.

It is a D-number.

It is a Duffinian number.

278463 is a lucky number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 278463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278413) 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, 46408 + ... + 46413.

It is an arithmetic number, because the mean of its divisors is an integer number (92822).

2²⁷⁸⁴⁶³ is an apocalyptic number.

278463 is a deficient number, since it is larger than the sum of its proper divisors (92825).

278463 is an equidigital number, since it uses as much as digits as its factorization.

278463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92824.

The product of its digits is 8064, while the sum is 30.

The square root of 278463 is about 527.6959351748. The cubic root of 278463 is about 65.3014010504.

It can be divided in two parts, 27846 and 3, that multiplied together give a palindrome (83538).

The spelling of 278463 in words is "two hundred seventy-eight thousand, four hundred sixty-three".