1278857455 has 16 divisors (see below), whose sum is σ = 1591733664. Its totient is φ = 985564800.

The previous prime is 1278857449. The next prime is 1278857471. The reversal of 1278857455 is 5547588721.

It is not a de Polignac number, because 1278857455 - 2⁵ = 1278857423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15537 + ... + 52906.

It is an arithmetic number, because the mean of its divisors is an integer number (99483354).

Almost surely, 2^1278857455 is an apocalyptic number.

1278857455 is a deficient number, since it is larger than the sum of its proper divisors (312876209).

1278857455 is a wasteful number, since it uses less digits than its factorization.

1278857455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68586.

The product of its digits is 3136000, while the sum is 52.

The square root of 1278857455 is about 35761.1165233973. The cubic root of 1278857455 is about 1085.4438937733.

The spelling of 1278857455 in words is "one billion, two hundred seventy-eight million, eight hundred fifty-seven thousand, four hundred fifty-five".