278597242 has 48 divisors (see below), whose sum is σ = 535407840. Its totient is φ = 107503200.

The previous prime is 278597239. The next prime is 278597257. The reversal of 278597242 is 242795872.

It is a junction number, because it is equal to n+sod(n) for n = 278597192 and 278597201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116317 + ... + 118687.

It is an arithmetic number, because the mean of its divisors is an integer number (11154330).

Almost surely, 2^278597242 is an apocalyptic number.

278597242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

278597242 is a deficient number, since it is larger than the sum of its proper divisors (256810598).

278597242 is a wasteful number, since it uses less digits than its factorization.

278597242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2500 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 278597242 is about 16691.2324889446. The cubic root of 278597242 is about 653.1189290798.

The spelling of 278597242 in words is "two hundred seventy-eight million, five hundred ninety-seven thousand, two hundred forty-two".