29997985039728 has 80 divisors (see below), whose sum is σ = 80245550935200. Its totient is φ = 9645067514880.

The previous prime is 29997985039723. The next prime is 29997985039801. The reversal of 29997985039728 is 82793058979992.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (87).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29997985039723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9132283 + ... + 11974746.

It is an arithmetic number, because the mean of its divisors is an integer number (1003069386690).

Almost surely, 2^{29997985039728} is an apocalyptic number.

It is an amenable number.

29997985039728 is an abundant number, since it is smaller than the sum of its proper divisors (50247565895472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29997985039728 is a wasteful number, since it uses less digits than its factorization.

29997985039728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21108090 (or 21108084 counting only the distinct ones).

The product of its (nonzero) digits is 11110659840, while the sum is 87.

The spelling of 29997985039728 in words is "twenty-nine trillion, nine hundred ninety-seven billion, nine hundred eighty-five million, thirty-nine thousand, seven hundred twenty-eight".