126721056 has 288 divisors, whose sum is σ = 441262080. Its totient is φ = 31449600.

The previous prime is 126721031. The next prime is 126721057. The reversal of 126721056 is 650127621.

It is not an unprimeable number, because it can be changed into a prime (126721057) 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, 1604025 + ... + 1604103.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^126721056 is an apocalyptic number.

126721056 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 126721056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220631040).

126721056 is an abundant number, since it is smaller than the sum of its proper divisors (314541024).

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

126721056 is a wasteful number, since it uses less digits than its factorization.

126721056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 126721056 is about 11257.0447276361. The cubic root of 126721056 is about 502.2842894839.

Adding to 126721056 its reverse (650127621), we get a palindrome (776848677).

The spelling of 126721056 in words is "one hundred twenty-six million, seven hundred twenty-one thousand, fifty-six".