29629987981 has 64 divisors (see below), whose sum is σ = 35324190720. Its totient is φ = 24585200640.

The previous prime is 29629987963. The next prime is 29629987987. The reversal of 29629987981 is 18978992692.

It is a de Polignac number, because none of the positive numbers 2^k-29629987981 is a prime.

It is a super-2 number, since 2×29629987981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29629987981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29629987987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87922645 + ... + 87922981.

It is an arithmetic number, because the mean of its divisors is an integer number (551940480).

Almost surely, 2^29629987981 is an apocalyptic number.

It is an amenable number.

29629987981 is a deficient number, since it is larger than the sum of its proper divisors (5694202739).

29629987981 is a wasteful number, since it uses less digits than its factorization.

29629987981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its digits is 70543872, while the sum is 70.

The spelling of 29629987981 in words is "twenty-nine billion, six hundred twenty-nine million, nine hundred eighty-seven thousand, nine hundred eighty-one".