1271825856 has 336 divisors, whose sum is σ = 4398264000. Its totient is φ = 343719936.

The previous prime is 1271825851. The next prime is 1271825869. The reversal of 1271825856 is 6585281721.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271825851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8535670 + ... + 8535818.

Almost surely, 2^1271825856 is an apocalyptic number.

1271825856 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 1271825856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2199132000).

1271825856 is an abundant number, since it is smaller than the sum of its proper divisors (3126438144).

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

1271825856 is a wasteful number, since it uses less digits than its factorization.

1271825856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 263 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 1271825856 is about 35662.6675390386. The cubic root of 1271825856 is about 1083.4508549640.

The spelling of 1271825856 in words is "one billion, two hundred seventy-one million, eight hundred twenty-five thousand, eight hundred fifty-six".