28525691 has 2 divisors, whose sum is σ = 28525692. Its totient is φ = 28525690.

The previous prime is 28525687. The next prime is 28525753. The reversal of 28525691 is 19652582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28525691 - 2² = 28525687 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28525621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14262845 + 14262846.

It is an arithmetic number, because the mean of its divisors is an integer number (14262846).

Almost surely, 2^28525691 is an apocalyptic number.

28525691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28525691 is an equidigital number, since it uses as much as digits as its factorization.

28525691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 38.

The square root of 28525691 is about 5340.9447666120. The cubic root of 28525691 is about 305.5474928463.

The spelling of 28525691 in words is "twenty-eight million, five hundred twenty-five thousand, six hundred ninety-one".