1278771456 has 36 divisors (see below), whose sum is σ = 3403398992. Its totient is φ = 426256896.

The previous prime is 1278771449. The next prime is 1278771469. The reversal of 1278771456 is 6541778721.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831766 + ... + 833301.

Almost surely, 2^1278771456 is an apocalyptic number.

1278771456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278771456 is an abundant number, since it is smaller than the sum of its proper divisors (2124627536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278771456 is an equidigital number, since it uses as much as digits as its factorization.

1278771456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665086 (or 1665072 counting only the distinct ones).

The product of its digits is 658560, while the sum is 48.

The square root of 1278771456 is about 35759.9140938565. The cubic root of 1278771456 is about 1085.4195623720.

The spelling of 1278771456 in words is "one billion, two hundred seventy-eight million, seven hundred seventy-one thousand, four hundred fifty-six".