28725359129 has 4 divisors (see below), whose sum is σ = 28727349684. Its totient is φ = 28723368576.

The previous prime is 28725359107. The next prime is 28725359137. The reversal of 28725359129 is 92195352782.

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 7806075904 + 20919283225 = 88352^2 + 144635^2 .

It is a cyclic number.

It is not a de Polignac number, because 28725359129 - 2⁸ = 28725358873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28725352129) 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, 973472 + ... + 1002545.

It is an arithmetic number, because the mean of its divisors is an integer number (7181837421).

Almost surely, 2^28725359129 is an apocalyptic number.

It is an amenable number.

28725359129 is a deficient number, since it is larger than the sum of its proper divisors (1990555).

28725359129 is a wasteful number, since it uses less digits than its factorization.

28725359129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990554.

The product of its digits is 2721600, while the sum is 53.

The spelling of 28725359129 in words is "twenty-eight billion, seven hundred twenty-five million, three hundred fifty-nine thousand, one hundred twenty-nine".