28725611 has 2 divisors, whose sum is σ = 28725612. Its totient is φ = 28725610.

The previous prime is 28725607. The next prime is 28725691. The reversal of 28725611 is 11652782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28725611 - 2² = 28725607 is a prime.

It is not a weakly prime, because it can be changed into another prime (28725691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362805 + 14362806.

It is an arithmetic number, because the mean of its divisors is an integer number (14362806).

Almost surely, 2^28725611 is an apocalyptic number.

28725611 is a deficient number, since it is larger than the sum of its proper divisors (1).

28725611 is an equidigital number, since it uses as much as digits as its factorization.

28725611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 28725611 is about 5359.6278788737. The cubic root of 28725611 is about 306.2596334051.

The spelling of 28725611 in words is "twenty-eight million, seven hundred twenty-five thousand, six hundred eleven".