29997928979281 has 8 divisors (see below), whose sum is σ = 30189137783400. Its totient is φ = 29806721937408.

The previous prime is 29997928979273. The next prime is 29997928979287. The reversal of 29997928979281 is 18297982979992.

It can be written as a sum of positive squares in 4 ways, for example, as 373584998656 + 29624343980625 = 611216^2 + 5442825^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 29997928979281 - 2³ = 29997928979273 is a prime.

It is a super-2 number, since 2×29997928979281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29997928979287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60372945 + ... + 60867793.

It is an arithmetic number, because the mean of its divisors is an integer number (3773642222925).

Almost surely, 2^{29997928979281} is an apocalyptic number.

It is an amenable number.

29997928979281 is a deficient number, since it is larger than the sum of its proper divisors (191208804119).

29997928979281 is a wasteful number, since it uses less digits than its factorization.

29997928979281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881123.

The product of its digits is 13332791808, while the sum is 91.

The spelling of 29997928979281 in words is "twenty-nine trillion, nine hundred ninety-seven billion, nine hundred twenty-eight million, nine hundred seventy-nine thousand, two hundred eighty-one".