28740427 has 2 divisors, whose sum is σ = 28740428. Its totient is φ = 28740426.

The previous prime is 28740403. The next prime is 28740433. The reversal of 28740427 is 72404782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28740427 - 2¹⁵ = 28707659 is a prime.

It is equal to p_1784617 and since 28740427 and 1784617 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28740392 and 28740401.

It is not a weakly prime, because it can be changed into another prime (28740497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14370213 + 14370214.

It is an arithmetic number, because the mean of its divisors is an integer number (14370214).

Almost surely, 2^28740427 is an apocalyptic number.

28740427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28740427 is an equidigital number, since it uses as much as digits as its factorization.

28740427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 28740427 is about 5361.0098862061. The cubic root of 28740427 is about 306.3122782132.

The spelling of 28740427 in words is "twenty-eight million, seven hundred forty thousand, four hundred twenty-seven".