29128103661887 has 4 divisors (see below), whose sum is σ = 29176731548400. Its totient is φ = 29079475775376.

The previous prime is 29128103661851. The next prime is 29128103661907. The reversal of 29128103661887 is 78816630182192.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 29128103661887 - 2²⁴ = 29128086884671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29128103061887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24313942358 + ... + 24313943555.

It is an arithmetic number, because the mean of its divisors is an integer number (7294182887100).

Almost surely, 2^{29128103661887} is an apocalyptic number.

29128103661887 is a deficient number, since it is larger than the sum of its proper divisors (48627886513).

29128103661887 is an equidigital number, since it uses as much as digits as its factorization.

29128103661887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48627886512.

The product of its (nonzero) digits is 13934592, while the sum is 62.

The spelling of 29128103661887 in words is "twenty-nine trillion, one hundred twenty-eight billion, one hundred three million, six hundred sixty-one thousand, eight hundred eighty-seven".