28993049689 has 4 divisors (see below), whose sum is σ = 29016489124. Its totient is φ = 28969610256.

The previous prime is 28993049663. The next prime is 28993049699. The reversal of 28993049689 is 98694039982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26931435664 + 2061614025 = 164108^2 + 45405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28993049689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28993049699) 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, 11717862 + ... + 11720335.

It is an arithmetic number, because the mean of its divisors is an integer number (7254122281).

Almost surely, 2^28993049689 is an apocalyptic number.

It is an amenable number.

28993049689 is a deficient number, since it is larger than the sum of its proper divisors (23439435).

28993049689 is a wasteful number, since it uses less digits than its factorization.

28993049689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23439434.

The product of its (nonzero) digits is 60466176, while the sum is 67.

The spelling of 28993049689 in words is "twenty-eight billion, nine hundred ninety-three million, forty-nine thousand, six hundred eighty-nine".