1287629268 has 24 divisors (see below), whose sum is σ = 3101387520. Its totient is φ = 415364160.

The previous prime is 1287629219. The next prime is 1287629269. The reversal of 1287629268 is 8629267821.

1287629268 is a modest number, since divided by 29268 gives 12876 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1287629268.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287629269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1730313 + ... + 1731056.

It is an arithmetic number, because the mean of its divisors is an integer number (129224480).

Almost surely, 2^1287629268 is an apocalyptic number.

It is an amenable number.

1287629268 is an abundant number, since it is smaller than the sum of its proper divisors (1813758252).

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

1287629268 is a wasteful number, since it uses less digits than its factorization.

1287629268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461407 (or 3461405 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 1287629268 is about 35883.5514964726. The cubic root of 1287629268 is about 1087.9199644215.

The spelling of 1287629268 in words is "one billion, two hundred eighty-seven million, six hundred twenty-nine thousand, two hundred sixty-eight".