278428853 has 2 divisors, whose sum is σ = 278428854. Its totient is φ = 278428852.

The previous prime is 278428819. The next prime is 278428877. The reversal of 278428853 is 358824872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246427204 + 32001649 = 15698^2 + 5657^2 .

It is a cyclic number.

It is not a de Polignac number, because 278428853 - 2¹⁰ = 278427829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278428798 and 278428807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278428883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139214426 + 139214427.

It is an arithmetic number, because the mean of its divisors is an integer number (139214427).

Almost surely, 2^278428853 is an apocalyptic number.

It is an amenable number.

278428853 is a deficient number, since it is larger than the sum of its proper divisors (1).

278428853 is an equidigital number, since it uses as much as digits as its factorization.

278428853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 860160, while the sum is 47.

The square root of 278428853 is about 16686.1874914553. The cubic root of 278428853 is about 652.9873170945.

The spelling of 278428853 in words is "two hundred seventy-eight million, four hundred twenty-eight thousand, eight hundred fifty-three".