1256726256 has 120 divisors (see below), whose sum is σ = 3475777536. Its totient is φ = 391036800.

The previous prime is 1256726239. The next prime is 1256726293. The reversal of 1256726256 is 6526276521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1091281 + ... + 1092431.

Almost surely, 2^1256726256 is an apocalyptic number.

1256726256 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 1256726256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1737888768).

1256726256 is an abundant number, since it is smaller than the sum of its proper divisors (2219051280).

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

1256726256 is a wasteful number, since it uses less digits than its factorization.

1256726256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251 (or 1222 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 1256726256 is about 35450.3350618862. The cubic root of 1256726256 is about 1079.1460602344.

The spelling of 1256726256 in words is "one billion, two hundred fifty-six million, seven hundred twenty-six thousand, two hundred fifty-six".