1267881378 has 16 divisors (see below), whose sum is σ = 2537504256. Its totient is φ = 422336880.

The previous prime is 1267881367. The next prime is 1267881409. The reversal of 1267881378 is 8731887621.

It is a self number, because there is not a number n which added to its sum of digits gives 1267881378.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63001 + ... + 80652.

It is an arithmetic number, because the mean of its divisors is an integer number (158594016).

Almost surely, 2^1267881378 is an apocalyptic number.

1267881378 is an abundant number, since it is smaller than the sum of its proper divisors (1269622878).

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

1267881378 is a wasteful number, since it uses less digits than its factorization.

1267881378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145129.

The product of its digits is 903168, while the sum is 51.

The square root of 1267881378 is about 35607.3219717518. The cubic root of 1267881378 is about 1082.3296129300.

The spelling of 1267881378 in words is "one billion, two hundred sixty-seven million, eight hundred eighty-one thousand, three hundred seventy-eight".