278606879 has 2 divisors, whose sum is σ = 278606880. Its totient is φ = 278606878.

The previous prime is 278606869. The next prime is 278606891. The reversal of 278606879 is 978606872.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278606879 - 2⁸ = 278606623 is a prime.

It is a super-2 number, since 2×278606879² = 155243586052241282, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278606879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278606819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139303439 + 139303440.

It is an arithmetic number, because the mean of its divisors is an integer number (139303440).

Almost surely, 2^278606879 is an apocalyptic number.

278606879 is a deficient number, since it is larger than the sum of its proper divisors (1).

278606879 is an equidigital number, since it uses as much as digits as its factorization.

278606879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The square root of 278606879 is about 16691.5211709419. The cubic root of 278606879 is about 653.1264597054.

The spelling of 278606879 in words is "two hundred seventy-eight million, six hundred six thousand, eight hundred seventy-nine".