28621427 has 2 divisors, whose sum is σ = 28621428. Its totient is φ = 28621426.

The previous prime is 28621399. The next prime is 28621447. The reversal of 28621427 is 72412682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28621427 - 2⁶ = 28621363 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28621393 and 28621402.

It is not a weakly prime, because it can be changed into another prime (28621447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14310713 + 14310714.

It is an arithmetic number, because the mean of its divisors is an integer number (14310714).

Almost surely, 2^28621427 is an apocalyptic number.

28621427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28621427 is an equidigital number, since it uses as much as digits as its factorization.

28621427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 28621427 is about 5349.8997186863. The cubic root of 28621427 is about 305.8889304559. Note that the first 3 decimals are identical.

The spelling of 28621427 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred twenty-seven".