1256220706 has 8 divisors (see below), whose sum is σ = 2029279644. Its totient is φ = 579794160.

The previous prime is 1256220703. The next prime is 1256220737. The reversal of 1256220706 is 6070226521.

It can be written as a sum of positive squares in 2 ways, for example, as 1029447225 + 226773481 = 32085^2 + 15059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1256220703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24158065 + ... + 24158116.

Almost surely, 2^1256220706 is an apocalyptic number.

1256220706 is a deficient number, since it is larger than the sum of its proper divisors (773058938).

1256220706 is a wasteful number, since it uses less digits than its factorization.

1256220706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48316196.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1256220706 is about 35443.2039465960. The cubic root of 1256220706 is about 1079.0013362051.

The spelling of 1256220706 in words is "one billion, two hundred fifty-six million, two hundred twenty thousand, seven hundred six".