1267408256 has 16 divisors (see below), whose sum is σ = 2524915140. Its totient is φ = 633704064.

The previous prime is 1267408231. The next prime is 1267408279. The reversal of 1267408256 is 6528047621.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950686 + ... + 4950941.

Almost surely, 2^1267408256 is an apocalyptic number.

1267408256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1267408256 is a deficient number, since it is larger than the sum of its proper divisors (1257506884).

1267408256 is an frugal number, since it uses more digits than its factorization.

1267408256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9901641 (or 9901629 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 1267408256 is about 35600.6777463576. The cubic root of 1267408256 is about 1082.1949689829.

The spelling of 1267408256 in words is "one billion, two hundred sixty-seven million, four hundred eight thousand, two hundred fifty-six".