28140487 has 2 divisors, whose sum is σ = 28140488. Its totient is φ = 28140486.

The previous prime is 28140479. The next prime is 28140493. The reversal of 28140487 is 78404182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28140487 - 2³ = 28140479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28140187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14070243 + 14070244.

It is an arithmetic number, because the mean of its divisors is an integer number (14070244).

Almost surely, 2^28140487 is an apocalyptic number.

28140487 is a deficient number, since it is larger than the sum of its proper divisors (1).

28140487 is an equidigital number, since it uses as much as digits as its factorization.

28140487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 28140487 is about 5304.7607863126. The cubic root of 28140487 is about 304.1659088324.

The spelling of 28140487 in words is "twenty-eight million, one hundred forty thousand, four hundred eighty-seven".