28987747 has 2 divisors, whose sum is σ = 28987748. Its totient is φ = 28987746.

The previous prime is 28987681. The next prime is 28987769. The reversal of 28987747 is 74778982.

It is a happy number.

28987747 is nontrivially palindromic in base 5.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28987747 is a prime.

It is a super-2 number, since 2×28987747² = 1680578952272018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28987694 and 28987703.

It is not a weakly prime, because it can be changed into another prime (28997747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14493873 + 14493874.

It is an arithmetic number, because the mean of its divisors is an integer number (14493874).

Almost surely, 2^28987747 is an apocalyptic number.

28987747 is a deficient number, since it is larger than the sum of its proper divisors (1).

28987747 is an equidigital number, since it uses as much as digits as its factorization.

28987747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 52.

The square root of 28987747 is about 5384.0270244493. The cubic root of 28987747 is about 307.1884062454.

The spelling of 28987747 in words is "twenty-eight million, nine hundred eighty-seven thousand, seven hundred forty-seven".