278045 has 4 divisors (see below), whose sum is σ = 333660. Its totient is φ = 222432.

The previous prime is 278041. The next prime is 278051. The reversal of 278045 is 540872.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 196249 = 286^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 278045 - 2² = 278041 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278041) 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, 27800 + ... + 27809.

It is an arithmetic number, because the mean of its divisors is an integer number (83415).

2²⁷⁸⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

278045 is a deficient number, since it is larger than the sum of its proper divisors (55615).

278045 is an equidigital number, since it uses as much as digits as its factorization.

278045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55614.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 278045 is about 527.2997250142. The cubic root of 278045 is about 65.2687101064.

The spelling of 278045 in words is "two hundred seventy-eight thousand, forty-five".