278740967 has 2 divisors, whose sum is σ = 278740968. Its totient is φ = 278740966.

The previous prime is 278740951. The next prime is 278740981. The reversal of 278740967 is 769047872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 278740967 - 2⁴ = 278740951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278740667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139370483 + 139370484.

It is an arithmetic number, because the mean of its divisors is an integer number (139370484).

Almost surely, 2^278740967 is an apocalyptic number.

278740967 is a deficient number, since it is larger than the sum of its proper divisors (1).

278740967 is an equidigital number, since it uses as much as digits as its factorization.

278740967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The square root of 278740967 is about 16695.5373378637. The cubic root of 278740967 is about 653.2312218649.

The spelling of 278740967 in words is "two hundred seventy-eight million, seven hundred forty thousand, nine hundred sixty-seven".