28727591 has 2 divisors, whose sum is σ = 28727592. Its totient is φ = 28727590.

The previous prime is 28727557. The next prime is 28727623. The reversal of 28727591 is 19572782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28727591 - 2¹⁰ = 28726567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28727551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14363795 + 14363796.

It is an arithmetic number, because the mean of its divisors is an integer number (14363796).

Almost surely, 2^28727591 is an apocalyptic number.

28727591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28727591 is an equidigital number, since it uses as much as digits as its factorization.

28727591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 28727591 is about 5359.8125900072. The cubic root of 28727591 is about 306.2666698687.

The spelling of 28727591 in words is "twenty-eight million, seven hundred twenty-seven thousand, five hundred ninety-one".