278391245 has 32 divisors (see below), whose sum is σ = 380121984. Its totient is φ = 193939200.

The previous prime is 278391233. The next prime is 278391247. The reversal of 278391245 is 542193872.

It is not a de Polignac number, because 278391245 - 2⁴ = 278391229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278391247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124235 + ... + 126455.

It is an arithmetic number, because the mean of its divisors is an integer number (11878812).

Almost surely, 2^278391245 is an apocalyptic number.

It is an amenable number.

278391245 is a deficient number, since it is larger than the sum of its proper divisors (101730739).

278391245 is a wasteful number, since it uses less digits than its factorization.

278391245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333.

The product of its digits is 120960, while the sum is 41.

The square root of 278391245 is about 16685.0605333034. The cubic root of 278391245 is about 652.9579156244.

The spelling of 278391245 in words is "two hundred seventy-eight million, three hundred ninety-one thousand, two hundred forty-five".