28876649 has 2 divisors, whose sum is σ = 28876650. Its totient is φ = 28876648.

The previous prime is 28876621. The next prime is 28876651. The reversal of 28876649 is 94667882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21949225 + 6927424 = 4685^2 + 2632^2 .

It is a cyclic number.

It is not a de Polignac number, because 28876649 - 2¹² = 28872553 is a prime.

Together with 28876651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28876597 and 28876606.

It is not a weakly prime, because it can be changed into another prime (28876699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14438324 + 14438325.

It is an arithmetic number, because the mean of its divisors is an integer number (14438325).

Almost surely, 2^28876649 is an apocalyptic number.

It is an amenable number.

28876649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28876649 is an equidigital number, since it uses as much as digits as its factorization.

28876649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 50.

The square root of 28876649 is about 5373.6997497069. The cubic root of 28876649 is about 306.7954619422.

The spelling of 28876649 in words is "twenty-eight million, eight hundred seventy-six thousand, six hundred forty-nine".