28891747 has 2 divisors, whose sum is σ = 28891748. Its totient is φ = 28891746.

The previous prime is 28891739. The next prime is 28891771. The reversal of 28891747 is 74719882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28891747 - 2³ = 28891739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28891697 and 28891706.

It is not a weakly prime, because it can be changed into another prime (28891717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14445873 + 14445874.

It is an arithmetic number, because the mean of its divisors is an integer number (14445874).

Almost surely, 2^28891747 is an apocalyptic number.

28891747 is a deficient number, since it is larger than the sum of its proper divisors (1).

28891747 is an equidigital number, since it uses as much as digits as its factorization.

28891747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 28891747 is about 5375.1043710797. The cubic root of 28891747 is about 306.8489214098.

The spelling of 28891747 in words is "twenty-eight million, eight hundred ninety-one thousand, seven hundred forty-seven".