28725691 has 2 divisors, whose sum is σ = 28725692. Its totient is φ = 28725690.

The previous prime is 28725611. The next prime is 28725709. The reversal of 28725691 is 19652782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28725691 - 2¹³ = 28717499 is a prime.

It is not a weakly prime, because it can be changed into another prime (28725611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362845 + 14362846.

It is an arithmetic number, because the mean of its divisors is an integer number (14362846).

Almost surely, 2^28725691 is an apocalyptic number.

28725691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28725691 is an equidigital number, since it uses as much as digits as its factorization.

28725691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 28725691 is about 5359.6353420732. The cubic root of 28725691 is about 306.2599177130.

The spelling of 28725691 in words is "twenty-eight million, seven hundred twenty-five thousand, six hundred ninety-one".