28913936749 has 4 divisors (see below), whose sum is σ = 29023875936. Its totient is φ = 28803997564.

The previous prime is 28913936699. The next prime is 28913936791. The reversal of 28913936749 is 94763931982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94763931982 = 2 ⋅47381965991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28913936749 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 (28913916749) 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, 54969199 + ... + 54969724.

It is an arithmetic number, because the mean of its divisors is an integer number (7255968984).

Almost surely, 2^28913936749 is an apocalyptic number.

It is an amenable number.

28913936749 is a deficient number, since it is larger than the sum of its proper divisors (109939187).

28913936749 is a wasteful number, since it uses less digits than its factorization.

28913936749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109939186.

The product of its digits is 17635968, while the sum is 61.

The spelling of 28913936749 in words is "twenty-eight billion, nine hundred thirteen million, nine hundred thirty-six thousand, seven hundred forty-nine".