278740842 has 32 divisors (see below), whose sum is σ = 567939840. Its totient is φ = 91177920.

The previous prime is 278740831. The next prime is 278740843. The reversal of 278740842 is 248047872.

It is a junction number, because it is equal to n+sod(n) for n = 278740794 and 278740803.

It is not an unprimeable number, because it can be changed into a prime (278740843) 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, 267759 + ... + 268797.

It is an arithmetic number, because the mean of its divisors is an integer number (17748120).

Almost surely, 2^278740842 is an apocalyptic number.

278740842 is an abundant number, since it is smaller than the sum of its proper divisors (289198998).

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

278740842 is a wasteful number, since it uses less digits than its factorization.

278740842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838.

The product of its (nonzero) digits is 200704, while the sum is 42.

The square root of 278740842 is about 16695.5335943479. The cubic root of 278740842 is about 653.2311242188.

The spelling of 278740842 in words is "two hundred seventy-eight million, seven hundred forty thousand, eight hundred forty-two".