28939857049 has 6 divisors (see below), whose sum is σ = 30543173610. Its totient is φ = 27416706336.

The previous prime is 28939857047. The next prime is 28939857143. The reversal of 28939857049 is 94075893982.

It can be written as a sum of positive squares in only one way, i.e., 25351008400 + 3588848649 = 159220^2 + 59907^2 .

It is not a de Polignac number, because 28939857049 - 2¹ = 28939857047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28939857047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40082544 + ... + 40083265.

It is an arithmetic number, because the mean of its divisors is an integer number (5090528935).

Almost surely, 2^28939857049 is an apocalyptic number.

It is an amenable number.

28939857049 is a deficient number, since it is larger than the sum of its proper divisors (1603316561).

28939857049 is an equidigital number, since it uses as much as digits as its factorization.

28939857049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80165847 (or 80165828 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 28939857049 in words is "twenty-eight billion, nine hundred thirty-nine million, eight hundred fifty-seven thousand, forty-nine".