28991029247 has 16 divisors (see below), whose sum is σ = 30215280480. Its totient is φ = 27791828352.

The previous prime is 28991029219. The next prime is 28991029261. The reversal of 28991029247 is 74292019982.

It is a Cunningham number, because it is equal to 3072³-1.

It is not a de Polignac number, because 28991029247 - 2¹⁴ = 28991012863 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 4 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28991029447) 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, 1132829 + ... + 1158137.

It is an arithmetic number, because the mean of its divisors is an integer number (1888455030).

Almost surely, 2^28991029247 is an apocalyptic number.

28991029247 is a deficient number, since it is larger than the sum of its proper divisors (1224251233).

28991029247 is a wasteful number, since it uses less digits than its factorization.

28991029247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25802.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 28991029247 in words is "twenty-eight billion, nine hundred ninety-one million, twenty-nine thousand, two hundred forty-seven".