28731487 has 2 divisors, whose sum is σ = 28731488. Its totient is φ = 28731486.

The previous prime is 28731473. The next prime is 28731491. The reversal of 28731487 is 78413782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28731487 - 2⁷ = 28731359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28731457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365743 + 14365744.

It is an arithmetic number, because the mean of its divisors is an integer number (14365744).

Almost surely, 2^28731487 is an apocalyptic number.

28731487 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731487 is an equidigital number, since it uses as much as digits as its factorization.

28731487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 40.

The square root of 28731487 is about 5360.1760232291. The cubic root of 28731487 is about 306.2805144105.

The spelling of 28731487 in words is "twenty-eight million, seven hundred thirty-one thousand, four hundred eighty-seven".