1297728706 has 16 divisors (see below), whose sum is σ = 1972859328. Its totient is φ = 640166800.

The previous prime is 1297728697. The next prime is 1297728721. The reversal of 1297728706 is 6078277921.

It is a self number, because there is not a number n which added to its sum of digits gives 1297728706.

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, 31011 + ... + 59641.

It is an arithmetic number, because the mean of its divisors is an integer number (123303708).

Almost surely, 2^1297728706 is an apocalyptic number.

1297728706 is a deficient number, since it is larger than the sum of its proper divisors (675130622).

1297728706 is a wasteful number, since it uses less digits than its factorization.

1297728706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28937.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 1297728706 is about 36024.0018043526. The cubic root of 1297728706 is about 1090.7569037882.

The spelling of 1297728706 in words is "one billion, two hundred ninety-seven million, seven hundred twenty-eight thousand, seven hundred six".