28899239849 has 4 divisors (see below), whose sum is σ = 28938135936. Its totient is φ = 28860343764.

The previous prime is 28899239839. The next prime is 28899239851. The reversal of 28899239849 is 94893299882.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28899239849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28899239839) 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, 19446929 + ... + 19448414.

It is an arithmetic number, because the mean of its divisors is an integer number (7234533984).

Almost surely, 2^28899239849 is an apocalyptic number.

It is an amenable number.

28899239849 is a deficient number, since it is larger than the sum of its proper divisors (38896087).

28899239849 is an equidigital number, since it uses as much as digits as its factorization.

28899239849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38896086.

The product of its digits is 161243136, while the sum is 71.

The spelling of 28899239849 in words is "twenty-eight billion, eight hundred ninety-nine million, two hundred thirty-nine thousand, eight hundred forty-nine".