30971622728 has 36 divisors (see below), whose sum is σ = 59494822515. Its totient is φ = 15115223088.

The previous prime is 30971622727. The next prime is 30971622757. The reversal of 30971622728 is 82722617903.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 15485811364 + 15485811364 = 124442^2 + 124442^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=124442.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30971622727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21403301 + ... + 21404747.

Almost surely, 2^30971622728 is an apocalyptic number.

It is an amenable number.

30971622728 is a deficient number, since it is larger than the sum of its proper divisors (28523199787).

30971622728 is an frugal number, since it uses more digits than its factorization.

30971622728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 30971622728 in words is "thirty billion, nine hundred seventy-one million, six hundred twenty-two thousand, seven hundred twenty-eight".