1267881856 has 64 divisors (see below), whose sum is σ = 2750634000. Its totient is φ = 579833856.

The previous prime is 1267881821. The next prime is 1267881871. The reversal of 1267881856 is 6581887621.

It is a tau number, because it is divible by the number of its divisors (64).

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 in 7 ways as a sum of consecutive naturals, for example, 61540 + ... + 79516.

Almost surely, 2^1267881856 is an apocalyptic number.

1267881856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1267881856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375317000).

1267881856 is an abundant number, since it is smaller than the sum of its proper divisors (1482752144).

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

1267881856 is a wasteful number, since it uses less digits than its factorization.

1267881856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18039 (or 18027 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 52.

The square root of 1267881856 is about 35607.3286838538. The cubic root of 1267881856 is about 1082.3297489452.

The spelling of 1267881856 in words is "one billion, two hundred sixty-seven million, eight hundred eighty-one thousand, eight hundred fifty-six".