278486479 has 2 divisors, whose sum is σ = 278486480. Its totient is φ = 278486478.

The previous prime is 278486441. The next prime is 278486501. The reversal of 278486479 is 974684872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278486479 - 2⁹ = 278485967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278486279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139243239 + 139243240.

It is an arithmetic number, because the mean of its divisors is an integer number (139243240).

Almost surely, 2^278486479 is an apocalyptic number.

278486479 is a deficient number, since it is larger than the sum of its proper divisors (1).

278486479 is an equidigital number, since it uses as much as digits as its factorization.

278486479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 55.

The square root of 278486479 is about 16687.9141596546. The cubic root of 278486479 is about 653.0323632539.

The spelling of 278486479 in words is "two hundred seventy-eight million, four hundred eighty-six thousand, four hundred seventy-nine".