28993049691 has 16 divisors (see below), whose sum is σ = 39156149760. Its totient is φ = 19079442720.

The previous prime is 28993049663. The next prime is 28993049699. The reversal of 28993049691 is 19694039982.

It is not a de Polignac number, because 28993049691 - 2⁶ = 28993049627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28993049699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1175401 + ... + 1199813.

It is an arithmetic number, because the mean of its divisors is an integer number (2447259360).

Almost surely, 2^28993049691 is an apocalyptic number.

28993049691 is a deficient number, since it is larger than the sum of its proper divisors (10163100069).

28993049691 is a wasteful number, since it uses less digits than its factorization.

28993049691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29506.

The product of its (nonzero) digits is 7558272, while the sum is 60.

The spelling of 28993049691 in words is "twenty-eight billion, nine hundred ninety-three million, forty-nine thousand, six hundred ninety-one".