278836242 has 32 divisors (see below), whose sum is σ = 579225600. Its totient is φ = 89420688.

The previous prime is 278836231. The next prime is 278836249. The reversal of 278836242 is 242638872.

It is a junction number, because it is equal to n+sod(n) for n = 278836194 and 278836203.

It is not an unprimeable number, because it can be changed into a prime (278836249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8259 + ... + 25017.

It is an arithmetic number, because the mean of its divisors is an integer number (18100800).

Almost surely, 2^278836242 is an apocalyptic number.

278836242 is an abundant number, since it is smaller than the sum of its proper divisors (300389358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278836242 is a wasteful number, since it uses less digits than its factorization.

278836242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16870.

The product of its digits is 258048, while the sum is 42.

The square root of 278836242 is about 16698.3904014728. The cubic root of 278836242 is about 653.3056392421.

The spelling of 278836242 in words is "two hundred seventy-eight million, eight hundred thirty-six thousand, two hundred forty-two".