28401547 has 2 divisors, whose sum is σ = 28401548. Its totient is φ = 28401546.

The previous prime is 28401517. The next prime is 28401557. The reversal of 28401547 is 74510482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28401547 - 2⁷ = 28401419 is a prime.

It is not a weakly prime, because it can be changed into another prime (28401517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200773 + 14200774.

It is an arithmetic number, because the mean of its divisors is an integer number (14200774).

Almost surely, 2^28401547 is an apocalyptic number.

28401547 is a deficient number, since it is larger than the sum of its proper divisors (1).

28401547 is an equidigital number, since it uses as much as digits as its factorization.

28401547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 28401547 is about 5329.3101805018. The cubic root of 28401547 is about 305.1036000295.

The spelling of 28401547 in words is "twenty-eight million, four hundred one thousand, five hundred forty-seven".