28525398439 has 2 divisors, whose sum is σ = 28525398440. Its totient is φ = 28525398438.

The previous prime is 28525398431. The next prime is 28525398443. The reversal of 28525398439 is 93489352582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28525398439 - 2³ = 28525398431 is a prime.

It is a super-2 number, since 2×28525398439² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28525398431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14262699219 + 14262699220.

It is an arithmetic number, because the mean of its divisors is an integer number (14262699220).

Almost surely, 2^28525398439 is an apocalyptic number.

28525398439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28525398439 is an equidigital number, since it uses as much as digits as its factorization.

28525398439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18662400, while the sum is 58.

The spelling of 28525398439 in words is "twenty-eight billion, five hundred twenty-five million, three hundred ninety-eight thousand, four hundred thirty-nine".