1271663040 has 56 divisors (see below), whose sum is σ = 4037533200. Its totient is φ = 339109888.

The previous prime is 1271663033. The next prime is 1271663051. The reversal of 1271663040 is 403661721.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1271662989 and 1271663007.

It is a congruent number.

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, 661365 + ... + 663284.

Almost surely, 2^1271663040 is an apocalyptic number.

1271663040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271663040 is an abundant number, since it is smaller than the sum of its proper divisors (2765870160).

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

1271663040 is a wasteful number, since it uses less digits than its factorization.

1271663040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324669 (or 1324659 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1271663040 is about 35660.3847427366. The cubic root of 1271663040 is about 1083.4046194248.

The spelling of 1271663040 in words is "one billion, two hundred seventy-one million, six hundred sixty-three thousand, forty".