278689255 has 16 divisors (see below), whose sum is σ = 360962784. Its totient is φ = 205338240.

The previous prime is 278689249. The next prime is 278689261. The reversal of 278689255 is 552986872.

It is an interprime number because it is at equal distance from previous prime (278689249) and next prime (278689261).

It is not a de Polignac number, because 278689255 - 2⁵ = 278689223 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25765 + ... + 34945.

It is an arithmetic number, because the mean of its divisors is an integer number (22560174).

Almost surely, 2^278689255 is an apocalyptic number.

278689255 is a deficient number, since it is larger than the sum of its proper divisors (82273529).

278689255 is a wasteful number, since it uses less digits than its factorization.

278689255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9666.

The product of its digits is 2419200, while the sum is 52.

The square root of 278689255 is about 16693.9885887106. The cubic root of 278689255 is about 653.1908235667.

The spelling of 278689255 in words is "two hundred seventy-eight million, six hundred eighty-nine thousand, two hundred fifty-five".