278145 has 24 divisors (see below), whose sum is σ = 551616. Its totient is φ = 127008.

The previous prime is 278143. The next prime is 278147. The reversal of 278145 is 541872.

It is an interprime number because it is at equal distance from previous prime (278143) and next prime (278147).

It is not a de Polignac number, because 278145 - 2¹ = 278143 is a prime.

It is a d-powerful number, because it can be written as 2⁴ + 7³ + 1 + 8⁶ + 4² + 5⁶ .

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

It is not an unprimeable number, because it can be changed into a prime (278143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127 + ... + 756.

It is an arithmetic number, because the mean of its divisors is an integer number (22984).

2²⁷⁸¹⁴⁵ is an apocalyptic number.

It is an amenable number.

278145 is a deficient number, since it is larger than the sum of its proper divisors (273471).

278145 is a wasteful number, since it uses less digits than its factorization.

278145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 898 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 278145 is about 527.3945392209. The cubic root of 278145 is about 65.2765338864.

The spelling of 278145 in words is "two hundred seventy-eight thousand, one hundred forty-five".