28725539 has 2 divisors, whose sum is σ = 28725540. Its totient is φ = 28725538.

The previous prime is 28725527. The next prime is 28725559. The reversal of 28725539 is 93552782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28725539 - 2¹⁶ = 28660003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28725496 and 28725505.

It is not a weakly prime, because it can be changed into another prime (28725559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362769 + 14362770.

It is an arithmetic number, because the mean of its divisors is an integer number (14362770).

Almost surely, 2^28725539 is an apocalyptic number.

28725539 is a deficient number, since it is larger than the sum of its proper divisors (1).

28725539 is an equidigital number, since it uses as much as digits as its factorization.

28725539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 28725539 is about 5359.6211619852. The cubic root of 28725539 is about 306.2593775277.

The spelling of 28725539 in words is "twenty-eight million, seven hundred twenty-five thousand, five hundred thirty-nine".