28991029249 has 32 divisors (see below), whose sum is σ = 35930048000. Its totient is φ = 22778578944.

The previous prime is 28991029219. The next prime is 28991029261. The reversal of 28991029249 is 94292019982.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28991029249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28991029249.

It is not an unprimeable number, because it can be changed into a prime (28991029219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9146737 + ... + 9149905.

It is an arithmetic number, because the mean of its divisors is an integer number (1122814000).

It is a Proth number, since it is equal to 27 ⋅ 2³⁰ + 1 and 27 < 2³⁰.

Almost surely, 2^28991029249 is an apocalyptic number.

It is an amenable number.

28991029249 is a deficient number, since it is larger than the sum of its proper divisors (6939018751).

28991029249 is a wasteful number, since it uses less digits than its factorization.

28991029249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 28991029249 in words is "twenty-eight billion, nine hundred ninety-one million, twenty-nine thousand, two hundred forty-nine".